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Important Questions: CBSE Class 6 Mathematics Chapter 3 Number Play

Number Play is one of the most scoring chapters in CBSE Class 6 Mathematics, yet many students lose marks due to careless errors in place value, comma placement, and rounding. This chapter tests your ability to read, write, compare, and operate on large numbers using both Indian and International systems, and to apply Roman numerals and estimation in practical scenarios. Below, we present 15-18 important questions — from 1-mark MCQs to 5-mark case studies — with detailed model answers, exactly as CBSE expects in 2025 term exams.

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Key takeaways

  • ✓Chapter 3 Number Play typically carries 8-10 marks in CBSE Class 6 term exams, split between MCQs, VSA, short-answer, and long-answer questions.
  • ✓Most 1-mark questions test place value identification, Roman numeral conversion, and quick rounding to the nearest 10, 100, or 1000.
  • ✓2-mark questions ask for number system conversions (Indian ↔ International) and simple arithmetic with large numbers.
  • ✓3-mark questions require multi-step problems like estimation in real-life contexts, expanded form writing, and comparison of large numbers.
  • ✓5-mark case-based questions integrate Number Play concepts with word problems involving population data, prices, or distances.
  • ✓Common mistakes include misplacing commas in the Indian system, incorrect rounding direction, and confusing Roman numeral subtraction rules.
  • ✓Practising 15+ varied questions with step-by-step solutions builds confidence and ensures full marks in this high-weightage chapter.

Chapter Overview and Marks Weightage in CBSE Exams

Chapter 3 Number Play introduces students to handling numbers up to 8 digits and beyond, a critical skill for higher mathematics and everyday numeracy. In the CBSE Class 6 term exams, this chapter typically accounts for 8 to 10 marks out of the 80-mark paper. The distribution is strategic: 2-3 marks come from objective questions (MCQs and Very Short Answer), 4-5 marks from short-answer questions (2-mark and 3-mark), and 3-4 marks from a long-answer or case-based question worth 4 or 5 marks. CBSE question-setters draw heavily from NCERT textbook exercises, examples, and the 'Try These' sections, so familiarity with every worked example in the textbook is non-negotiable. The chapter tests conceptual clarity (place value, number names), procedural fluency (arithmetic with large numbers, rounding), and application (real-world estimation, Roman numeral reading). Because the Indian number system is unique to our curriculum, expect at least one question contrasting it with the International system. Roman numerals appear almost every year, usually as a 1-mark or 2-mark question. Number puzzles and pattern-based reasoning questions are common in the subjective section, rewarding logical thinking. Students who practise writing numbers in both word and numeral forms, and who double-check comma placement, consistently score full marks here.
  • Typical weightage: 8-10 marks in the 80-mark term exam
  • 1-mark objective: place value, Roman numerals, rounding (2-3 questions)
  • 2-mark short answer: conversions, comparisons, expanded form (2 questions)
  • 3-mark descriptive: multi-step arithmetic, estimation, word problems (1-2 questions)
  • 4-5 mark case-based: integrated problem linking population, money, or distance data (1 question)

1-Mark Questions: MCQs and Very Short Answer (VSA)

One-mark questions in Number Play test instant recall and basic application. CBSE favours MCQs on place value identification, quick rounding, Roman numeral values, and identifying the largest or smallest number from a set. Very Short Answer questions ask for a single-step conversion or a brief explanation. These questions are designed to be solved in under one minute each, so speed and accuracy are paramount. Common themes include: writing the place value of a given digit in a large number, rounding a 5-digit or 6-digit number to the nearest hundred or thousand, converting a small Roman numeral (under 100) to Hindu-Arabic, and identifying the predecessor or successor of a number. Students often lose marks by misreading the place (confusing ten-thousands with lakhs, for instance), or by rounding in the wrong direction (rounding 4,567 to 5,000 instead of 4,600 when asked for the nearest hundred). Always underline the key term in the question — 'nearest thousand', 'lakh place', 'predecessor' — before answering. Write your final answer clearly; in MCQs, double-check the option letter. Below are six representative 1-mark questions with model answers.
  • Q1. In the number 5,47,839, what is the place value of the digit 4? (A) 40,000 (B) 4,00,000 (C) 4,000 (D) 40. **Answer: (A) 40,000** (The 4 is in the ten-thousands place: 4 × 10,000 = 40,000.)
  • Q2. Round 8,765 to the nearest hundred. **Answer: 8,800** (The hundreds digit is 7; the digit to its right is 6. Since 6 ≥ 5, round up: 7 becomes 8, and all digits to the right become 0.)
  • Q3. Write the Roman numeral for 49. **Answer: XLIX** (50 − 1 = 49; write as XL (40) + IX (9) = XLIX.)
  • Q4. What is the successor of 9,99,999? **Answer: 10,00,000** (Successor means the next number: 9,99,999 + 1 = 10,00,000, which is ten lakh.)
  • Q5. Which is greater: 12 lakh or 1 million? **Answer: 12 lakh** (1 lakh = 1,00,000; 12 lakh = 12,00,000. 1 million = 10,00,000. So 12,00,000 > 10,00,000.)
  • Q6. The number 7,02,145 in words (Indian system) is: (A) Seven lakh two thousand one forty-five (B) Seven lakh two thousand one hundred forty-five (C) Seventy lakh two thousand one hundred forty-five (D) Seven million two thousand one forty-five. **Answer: (B)** (7,02,145 reads as 'seven lakh two thousand one hundred forty-five'.)

2-Mark Questions: Conversions and Short Calculations

Two-mark questions require two clear steps or a brief explanation. Typical patterns include converting a number from Indian notation to International notation (or vice versa), writing the expanded form of a 6-digit or 7-digit number, comparing two large numbers and stating which is greater with reasoning, and performing one arithmetic operation (addition or subtraction) with numbers in lakhs or crores. CBSE awards 1 mark for method and 1 mark for the correct final answer, so even if your arithmetic slips, showing clear working can earn you partial credit. Always write the number in standard form, place commas correctly, and label your answer with the system (Indian or International) if the question specifies. When writing expanded form, break the number into place-value components: for example, 5,47,839 = 5,00,000 + 40,000 + 7,000 + 800 + 30 + 9. This is exactly what CBSE expects. Below are four representative 2-mark questions with step-by-step model answers.
  • Q7. Write 8,50,000 in the International system and in words. **Answer:** Indian: 8,50,000. International: 850,000 (eight hundred fifty thousand). (Step 1: Remove Indian commas; place International commas every 3 digits from right. Step 2: Write in words using International terminology.)
  • Q8. Write the expanded form of 6,42,735. **Answer:** 6,42,735 = 6,00,000 + 40,000 + 2,000 + 700 + 30 + 5. (Step 1: Identify each place value. Step 2: Write as sum of place values.)
  • Q9. Compare 15 lakh and 1.2 million. Which is greater and by how much? **Answer:** 15 lakh = 15,00,000. 1.2 million = 12,00,000. Difference = 15,00,000 − 12,00,000 = 3,00,000. So 15 lakh is greater by 3 lakh. (Step 1: Convert both to same system. Step 2: Subtract and state difference.)
  • Q10. Add 4,56,789 and 3,43,211. **Answer:** 4,56,789 + 3,43,211 = 8,00,000. (Step 1: Line up by place value and add column by column. Step 2: Write final answer with correct commas.)

3-Mark Questions: Application and Multi-Step Problems

Three-mark questions test deeper understanding and the ability to integrate concepts. Expect word problems involving estimation of sums or differences in real-life contexts (for example, estimating total attendance at three cricket matches, or total cost of items rounded to nearest thousand), arranging a set of large numbers in ascending or descending order with justification, converting a number between systems and then performing an operation, and solving number puzzles that require logical reasoning and knowledge of divisibility or digit sums. CBSE typically awards 1 mark for understanding and setup, 1 mark for method or working, and 1 mark for the correct final answer with units. Always write your steps clearly: state what you are doing ('First, I round each number to the nearest thousand'), show your working, and box or underline your final answer. If the question asks for estimation, make it clear that you have rounded; if it asks for the exact answer, do not round intermediate steps. Below are four representative 3-mark questions with detailed model answers.
  • Q11. A city's population in 2020 was 12,45,678 and in 2021 it was 13,56,789. Estimate the increase in population by rounding each to the nearest lakh. **Answer:** 2020 population ≈ 12,00,000 (12 lakh). 2021 population ≈ 14,00,000 (14 lakh, since 13,56,789 rounds up). Estimated increase = 14,00,000 − 12,00,000 = 2,00,000 (2 lakh). (Step 1: Round each number. Step 2: Subtract. Step 3: State answer with unit.)
  • Q12. Arrange the following in descending order: 10,00,000; 95,00,000; 1 crore; 9 million. **Answer:** First convert all to same system. 10,00,000 (10 lakh), 95,00,000 (95 lakh), 1 crore = 1,00,00,000 (100 lakh), 9 million = 90,00,000 (90 lakh). Descending order (largest first): 1 crore, 95,00,000, 9 million, 10,00,000. (Step 1: Convert. Step 2: Compare. Step 3: List in order.)
  • Q13. Write the Roman numeral MCMXCIV in Hindu-Arabic form and explain each symbol. **Answer:** M = 1000, CM = 900 (C before M means 1000 − 100), XC = 90 (X before C means 100 − 10), IV = 4 (I before V means 5 − 1). Total = 1000 + 900 + 90 + 4 = 1994. (Step 1: Break into parts. Step 2: Evaluate each. Step 3: Add.)
  • Q14. A number has 7 in the lakh place, 5 in the thousands place, and all other digits are 0. Write the number in numerals and in words (Indian system). **Answer:** Numeral: 7,05,000. Words: Seven lakh five thousand. (Step 1: Place 7 in lakh place (7,00,000) and 5 in thousands place (5,000). Step 2: Add them. Step 3: Write in words.)

5-Mark Questions: Case-Based and Long-Answer Problems

Five-mark questions, often styled as case studies or integrated problems, are the crown jewel of Number Play. CBSE presents a real-world scenario — a census report, a shopping bill, a distance table, or a budget statement — and asks 3 to 4 sub-questions that together test multiple concepts: reading large numbers, converting systems, rounding, arithmetic, and interpretation. For example, a case might give the populations of five Indian cities in lakhs and ask you to (a) write the largest and smallest in International notation, (b) estimate the total population by rounding, (c) find the difference between two cities, and (d) answer a Roman numeral or puzzle question related to the data. CBSE awards marks per sub-question, so attempt every part even if you are unsure about one. Show all working; even if your final number is wrong, method marks can save you. These questions reward careful reading (underline key data), systematic working (label each sub-question clearly), and neat presentation (use commas correctly, box final answers). Practising past-year case-based questions from CBSE sample papers is the best way to master this format. Below is one detailed 5-mark case-based question with model answers for all parts.

How CBSE Frames Questions from Number Play

CBSE question-setters follow a predictable blueprint for Number Play. They source numbers and contexts directly from NCERT textbook exercises, examples, and the 'Try These' marginal activities — so the first rule is to solve every single NCERT problem at least twice. Objective questions (MCQs) test definition recall and single-step application: place value of a digit, rounding to a specified place, Roman numeral conversion up to 100 or slightly beyond, and quick comparisons. These are designed to be solved in 30-60 seconds, so they avoid computational complexity but reward precision. Short-answer questions (2-mark, 3-mark) combine two or three micro-skills: for instance, 'Convert this number to International notation and then round it to the nearest hundred thousand' — that is a 3-mark question because it has two distinct steps plus final presentation. CBSE loves symmetry between the two number systems, so expect at least one question asking you to convert and compare. The language is often contextual: instead of saying 'Write 8,50,000 in words', the question might say 'The cost of a car is ₹8,50,000. Write this amount in words using the Indian system.' This tests reading comprehension as well as numeracy. Long-answer and case-based questions integrate Number Play with real-world data — population statistics, budgets, distances, sales figures. CBSE has used census data, cricket match attendance, and e-commerce sales in recent years. These questions have 3-4 parts, each worth 1-2 marks, and they scaffold from simple (reading a number) to complex (multi-step arithmetic or estimation). The key is that every question is anchored in a scenario, making it application-based rather than abstract. Roman numerals appear almost every year, usually worth 1 or 2 marks, and the numbers chosen are those that test the subtraction rule (like IV, IX, XL, XC, CD, CM). Number puzzles and logical reasoning questions — 'Find the missing digit', 'Arrange to form the largest number', 'A number whose digits sum to 18' — reward pattern recognition and are often placed in the 3-mark band. Finally, CBSE includes one estimation question each year, reflecting the real-world importance of approximate calculation. Students should practise rounding to the nearest 10, 100, 1000, and lakh, and understand when to round up versus round down.
  • NCERT exercises are the primary source; solve every problem in Chapter 3, including 'Try These' activities
  • MCQs focus on definitions, place value, Roman numerals, and quick rounding — speed and accuracy are key
  • 2-mark and 3-mark questions combine two micro-skills (convert + compare, expand + add, round + estimate)
  • Case-based questions present real-world data tables or scenarios with 3-4 linked sub-questions worth 1-2 marks each
  • At least one question every year contrasts Indian and International number systems, often involving conversion and comparison
  • Roman numerals are tested annually, with focus on subtraction-rule numbers (IV, IX, XL, XC, CD, CM) and values under 500
  • Estimation questions appear in the 2-3 mark band and test rounding followed by arithmetic on rounded values
  • Number puzzles reward logical thinking and pattern recognition; practise digit-sum rules and digit rearrangement

Common Mistakes Students Make (and How to Avoid Them)

Even strong students lose 2-3 marks in Number Play due to avoidable errors. The most frequent mistake is comma misplacement in the Indian system. Remember: in Indian notation, the first comma from the right comes after three digits (separating hundreds from thousands), and every comma thereafter comes after two digits. So 12,34,567 is correct; 1,23,4567 is wrong. Practise writing numbers with commas until it becomes automatic. Second, students confuse place value with face value. In 5,47,839, the digit 4 has a face value of 4 but a place value of 40,000 (because it sits in the ten-thousands place). Questions ask for place value, not face value, so always multiply the digit by its place. Third, rounding errors are epidemic. The rule is simple: look at the digit immediately to the right of the place you are rounding to. If it is 5 or more, round up; if less than 5, round down. Yet students often look at the wrong digit or round in the wrong direction. Write the number, circle the digit in the target place, underline the digit to its right, apply the rule, and then write zeros for all places to the right. Fourth, Roman numeral subtraction is misunderstood. Students see IV and add I + V = 6, instead of recognizing that a smaller symbol before a larger symbol means subtract: V − I = 4. Memorize the six subtraction cases: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900). Fifth, when converting between systems, students forget to re-place commas. After removing Indian commas, you must insert International commas (every 3 digits from the right), or the number looks wrong and you lose presentation marks. Sixth, in expanded form, students write incomplete expansions. Every non-zero digit must appear as (digit × place value). Seventh, in word problems, students fail to read carefully and answer a different question than asked. Underline key terms: 'nearest lakh', 'International system', 'in words', 'difference'. Eighth, arithmetic errors creep in when students rush. Double-check your addition and subtraction, especially with carries and borrows. Use a rough mental estimate to verify your answer makes sense. Finally, students skip units or labels. If the question asks for rupees, write ₹; if it asks for words, write words, not numerals. These small details matter for full marks.
  • Comma misplacement in Indian notation: remember 3 digits, then every 2 digits (e.g., 12,34,567, not 1,23,4567)
  • Confusing face value with place value: in 5,47,839, the 4 is worth 40,000, not 4
  • Rounding in the wrong direction: always check the digit to the *right* of the target place
  • Roman numeral subtraction errors: smaller before larger means subtract (IV = 4, not 6)
  • Forgetting to re-place commas after system conversion (Indian ↔ International)
  • Incomplete expanded forms: include every non-zero digit as (digit × place value)
  • Not reading the question carefully: underline keywords like 'nearest lakh', 'in words', 'International system'
  • Arithmetic slips: double-check addition/subtraction, verify with a mental estimate
  • Missing units or labels: if the question asks for rupees or words, provide exactly that

Practise Efficiently with CBSETUTOR.ai

Mastering Number Play requires solving a wide variety of questions under timed conditions, and getting instant, step-by-step feedback when you make a mistake. CBSETUTOR.ai gives your child a 24×7 AI tutor trained on the NCERT syllabus and CBSE exam patterns. Students can snap a photo of any Number Play problem — whether from the textbook, a worksheet, or a sample paper — and receive a detailed, worked solution within seconds, broken down exactly as a human tutor would explain it. The AI identifies where the student went wrong (comma placement, rounding error, Roman numeral mistake) and offers targeted tips to avoid that error next time. Beyond solving doubts, the platform generates unlimited practice questions at the right difficulty level, so your child can drill 1-mark MCQs, 3-mark word problems, and 5-mark case studies until every concept is second nature. Parents love the flat pricing: ₹999 per month for all subjects, all classes (6-12), with a risk-free 3-day trial. No per-question charges, no hidden fees, no pressure. Whether your child is in Class 6 or Class 12, whether they need help with one chapter or year-round support, the price stays the same. The AI tutor is patient, never judgmental, and available at 11 PM when doubts strike during homework. For Number Play specifically, students can practise converting between Indian and International systems, get instant feedback on expanded forms, and work through dozens of case-based scenarios. Think of it as having a subject expert on call, 24×7, for the cost of two pizzas a month. Thousands of CBSE families across India — in metro cities and Tier-2 towns alike — rely on CBSETUTOR.ai to fill the gap left by crowded classrooms and expensive coaching centres.
  • Snap and solve: upload any Number Play question via photo, get step-by-step solution in seconds
  • Instant error diagnosis: AI pinpoints exactly where you went wrong (comma, rounding, Roman numeral) and explains the fix
  • Unlimited practice: generate fresh MCQs, VSA, 3-mark, and case-based questions at your level
  • Flat ₹999/month for all subjects, all classes (6-12); no per-question fees, no pressure
  • 3-day free trial: try the AI tutor risk-free, cancel anytime if it does not help
  • 24×7 availability: doubts do not wait for tuition timings, and neither does CBSETUTOR.ai
  • Loved by CBSE families across metros and Tier-2 cities for bridging the classroom-coaching gap

Quick Revision Tips for Number Play

In the week before your exam, focus on high-yield revision strategies rather than re-reading the entire chapter. First, memorize the place-value chart for both Indian and International systems; draw it from memory and label each column correctly. Second, drill Roman numeral conversion: write I to C (1 to 100) in Roman numerals, focusing on the subtraction-rule numbers (IV, IX, XL, XC). Third, practise rounding: take 10 random 5-digit or 6-digit numbers and round each to the nearest 10, 100, 1000, and lakh; check your answers with a calculator or textbook. Fourth, solve 5 past-year or sample-paper questions on Indian ↔ International conversion; time yourself — you should finish each in under 2 minutes. Fifth, work through 3 case-based questions from CBSE sample papers, writing out every sub-question answer in full. This builds exam stamina and familiarizes you with the format. Sixth, write out the expanded form of 5 large numbers (6-digit, 7-digit, 8-digit); this is a common 2-mark question and easy marks if you practise. Seventh, revise the definitions: lakh, crore, million, billion, place value, face value, successor, predecessor, rounding, estimation. Be able to define each in one sentence. Eighth, make a one-page formula sheet listing comma placement rules, rounding rules, and Roman numeral values. Glance at this sheet every morning of exam week. Ninth, identify your personal weak spot — is it Roman numerals? Rounding? System conversion? — and spend 15 focused minutes daily on that alone. Finally, on exam day, read every Number Play question twice before answering. Underline the system (Indian or International), the operation (convert, compare, estimate), and the target (nearest lakh, in words, expanded form). These small habits prevent silly mistakes and ensure you score full marks on a high-weightage, high-scoring chapter.
  • Memorize and draw the place-value chart (Indian and International) from memory
  • Drill Roman numerals I-C, focusing on subtraction-rule numbers (IV, IX, XL, XC, CD, CM)
  • Practise rounding 10 random numbers to nearest 10, 100, 1000, lakh; check answers
  • Solve 5 conversion questions (Indian ↔ International) under timed conditions (2 min each)
  • Work through 3 full case-based questions from CBSE sample papers, writing every sub-answer
  • Write expanded form of 5 large numbers daily; this is an easy 2-mark question
  • Revise definitions: lakh, crore, million, place value, successor, predecessor, rounding
  • Create a one-page formula sheet (comma rules, rounding rules, Roman values); review daily
  • Identify and spend 15 focused minutes daily on your personal weak spot
  • On exam day: read every question twice, underline system/operation/target before answering

Blueprint for Scoring Full Marks in Number Play

Full marks in Number Play are within reach for every student who follows a disciplined approach. Start by ensuring you have solved every exercise problem in NCERT Chapter 3 at least twice — once when the chapter was taught, and once a week before the exam. The textbook examples are gold; CBSE lifts numbers and question styles directly from them. Next, practise writing numbers neatly with correct comma placement. Presentation matters: in board exams and school exams alike, a single misplaced comma can cost you a mark. Use a ruler for tables if a question asks you to present data. Third, master the art of showing working. Even in a 2-mark question, write the key step. For example, if asked to round 7,65,432 to the nearest lakh, write: 'The lakh digit is 7. The digit to the right is 6. Since 6 ≥ 5, I round up. Answer: 8,00,000.' This guarantees method marks even if you slip in arithmetic. Fourth, time management: allocate roughly 1 minute per mark. A 3-mark question should take 3 minutes. If you are stuck, move on and return later. Fifth, verify your answers. After writing, do a quick mental check: does the order of magnitude make sense? If you are converting 10 lakh to International notation, the answer should be around 1 million — if you wrote 100 million, you know something is wrong. Sixth, use estimation to cross-check exact calculations. If you added 4,56,789 and 3,43,211 and got 8,00,000, quickly round both to 4,60,000 and 3,40,000: sum ≈ 8,00,000. Your answer is consistent. Seventh, for Roman numerals, always double-check subtraction cases. Write the numeral out, mark which symbols are before larger symbols (indicating subtraction), and compute carefully. Eighth, read the mark distribution. A 5-mark case-based question has 4-5 sub-questions; each is typically 1 mark or 1.5 marks. Answer every part, even if you are unsure. Partial marks add up. Ninth, language precision: if the question says 'Write in words', write words; if it says 'Write in numerals', write numerals. Do not assume the examiner knows what you mean. Finally, stay calm. Number Play is straightforward and high-scoring. Avoid silly mistakes by slowing down, double-checking, and trusting your preparation.
  • Solve every NCERT exercise problem twice: once during study, once before exam
  • Practise neat writing with correct comma placement; use a ruler for data tables
  • Always show working, even in 2-mark questions; method marks can save you
  • Allocate roughly 1 minute per mark; move on if stuck, return later
  • Verify your answers: check order of magnitude, use estimation to cross-check arithmetic
  • Double-check Roman numeral subtraction cases (IV, IX, XL, XC, CD, CM)
  • Read mark distribution in case-based questions; attempt every sub-part for partial credit
  • Match your answer format to the question: 'in words' means words, 'in numerals' means numerals
  • Stay calm and slow down; Number Play is high-scoring if you avoid silly mistakes

Frequently asked questions

How many marks does Chapter 3 Number Play carry in CBSE Class 6 term exams?+
Number Play typically carries 8 to 10 marks in the 80-mark CBSE Class 6 Mathematics term exam. The marks are distributed across 1-mark MCQs or VSA (2-3 questions), 2-mark short-answer questions (2 questions), 3-mark descriptive questions (1-2 questions), and one 4-5 mark case-based or long-answer question. Because it is a foundational chapter, CBSE tests it thoroughly every year.
What is the difference between the Indian and International number systems?+
The Indian system groups digits after hundreds in sets of two (thousands, ten-thousands, lakhs, ten-lakhs, crores), and uses commas accordingly: 12,34,567. The International system groups digits in sets of three (thousands, millions, billions), with commas every three digits from the right: 1,234,567. One crore (Indian) equals ten million (International). Both represent the same quantity, just written and read differently.
How do I remember Roman numeral subtraction rules?+
Memorize the six key cases where a smaller symbol before a larger symbol means subtraction: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900). In all other cases, symbols are added. Practise writing numbers from 1 to 100 in Roman numerals, and the pattern will become automatic. The subtraction rule applies only when the smaller symbol is one step away (I before V or X; X before L or C; C before D or M).
What are the most common mistakes students make in Number Play questions?+
The top three mistakes are: (1) misplacing commas in the Indian system (e.g., writing 1,23,4567 instead of 12,34,567), (2) rounding in the wrong direction because they look at the wrong digit, and (3) confusing place value with face value (e.g., saying the 4 in 5,47,839 is worth 4 instead of 40,000). Avoiding these errors alone can save 2-3 marks per exam.
How should I prepare for the 5-mark case-based question on Number Play?+
Case-based questions present real-world data (population, budgets, distances) and ask 3-4 sub-questions testing different concepts. Practise at least 3-5 case studies from CBSE sample papers or past years. Read the data carefully, underline key numbers, answer each sub-question in order, show all working, and label your answers. Even if one sub-question is difficult, attempt the others for partial marks.
Why is place value important, and how is it tested in exams?+
Place value determines what each digit in a number represents. In 5,47,839, the 4 is in the ten-thousands place, so its place value is 40,000. CBSE tests place value through direct questions ('What is the place value of 4 in this number?') and indirectly through rounding, expanded form, and comparison questions. Mastering place value is the key to all operations on large numbers.
How can CBSETUTOR.ai help my child with Number Play?+
CBSETUTOR.ai provides a 24×7 AI tutor that solves any Number Play problem via photo upload, giving step-by-step explanations. It generates unlimited practice questions (MCQs, VSA, case-based) at the right difficulty, identifies exactly where your child makes mistakes (comma errors, rounding, Roman numerals), and offers instant feedback. The flat fee is ₹999/month for all subjects and classes 6-12, with a 3-day free trial, making it affordable and risk-free.
How do I convert a number from Indian to International notation quickly?+
Step 1: Remove the Indian commas. Step 2: Place International commas every 3 digits from the right. Step 3: Read using International terminology (million, billion). For example, 1,25,00,000 (Indian) → remove commas → 12500000 → place International commas → 12,500,000 → read as 'twelve million five hundred thousand'. Practise this on 5-10 numbers and it will become second nature.
What is the best way to practise rounding for the exam?+
Take 10 random 5-digit or 6-digit numbers. For each, practise rounding to the nearest 10, 100, 1000, and lakh. Write down your answer and verify it. The key is to identify the target place, look at the digit immediately to its right, and apply the rule (if ≥5 round up, if <5 round down). Doing this daily for a week will make rounding automatic and error-free.
How much time should I spend on Number Play during revision?+
Number Play is high-weightage (8-10 marks) and high-scoring, so dedicate about 2 hours total during your final week of revision. Spend 30 minutes memorizing place value and Roman numerals, 30 minutes solving 5-7 past-year questions, 30 minutes practising conversions and rounding, and 30 minutes working through 2 case-based questions with full written answers. This focused revision ensures you are exam-ready and confident.

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