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Important Questions

Number Play

CBSE · Class 8 · Mathematics

Most important questions from Number Play for CBSE Class 8 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.

45 questions24 flashcards5 concepts

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45 Questions·
multiple choicemultiple correcttext answer

Sample Questions

1multiple correct

Which expressions always give an even number for any integer values?

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2a + 4b, 6m + 8n, 4p + 2q

An expression is always even if all terms have even coefficients: 2a + 4b = 2(a + 2b), 6m + 8n = 2(3m + 4n), 4p + 2q = 2(2p + q). The expressions 3x + 5y and x² + 2 can be odd depending on the values.

2multiple correct

A number leaves remainder 3 when divided by 5. Which algebraic expressions represent such numbers?

Show answer

5k + 3, 5k - 2, 5k + 8

Numbers with remainder 3 when divided by 5: 5k + 3 (3 more than multiple of 5), 5k - 2 (2 less than multiple of 5), 5k + 8 = 5k + 5 + 3 = 5(k+1) + 3. The expression 3k + 5 doesn't follow this pattern.

3multiple choice

If two even numbers add to give a multiple of 4, what types of even numbers must they be?

Show answer

Both multiples of 4 OR both not multiples of 4

For sum to be multiple of 4: (4a) + (4b) = 4(a+b), or (4a+2) + (4b+2) = 4(a+b+1). When one is multiple of 4 and other isn't: 4a + (4b+2) = 4(a+b) + 2, which leaves remainder 2.

4multiple choice

Solve the cryptarithm: AB × 5 = BC (where A, B, C are different digits)

Show answer

A=1, B=8, C=0

AB × 5 = BC means (10A + B) × 5 = 10B + C. Expanding: 50A + 5B = 10B + C, so 50A = 5B + C. For A=1, B=8: 50 = 40 + 10, so C=0. Check: 18 × 5 = 90. ✓

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Frequently Asked Questions

What are the important topics in Number Play for CBSE Class 8 Mathematics?
Number Play covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Number Play — CBSE Class 8 Mathematics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Number Play?
There are 45 practice questions available for Number Play. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 7 chapters — CBSE Class 8 Mathematics Important Questions

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