Class 8 Mathematics Chapter 5: Number Play — practice questions with answers
Free practice for Class 8 Mathematics, Chapter 5: Number Play. Try the solved questions below, then take a free test with instant marking and explanations.
45 questions8 easy, 25 medium, 12 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. Which numbers can be written as a sum of two consecutive numbers?
- All odd numbers greater than 1
- All even numbers
- Only primes
- Only multiples of 3
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Answer: A. All odd numbers greater than 1
Why: n + (n + 1) = 2n + 1 is odd. [p.112]
Why: n + (n + 1) = 2n + 1 is odd. [p.112]
Q2. Evaluate 3 + 4 − 5 + 6.
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Answer: 8 (± 0)
Why: 3 + 4 − 5 + 6 = 8. [p.113]
Why: 3 + 4 − 5 + 6 = 8. [p.113]
Q3. Find (4 × 5 + 2) + (4 × 3 + 2) and check it is a multiple of 4. What is the sum?
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Answer: 36 (± 0)
Why: 22 + 14 = 36 = 4 × 9. [p.117]
Why: 22 + 14 = 36 = 4 × 9. [p.117]
Q4. If a number is divisible by 12, it is divisible by all the factors of 12.
True or false?
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Answer: True
Why: 12m = 2 × 6 × m = 3 × 4 × m. [p.120]
Why: 12m = 2 × 6 × m = 3 × 4 × m. [p.120]
Q5. Repeatedly adding the digits of a number until a single digit remains gives its digital ______.
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Answer: root
Why: Aryabhata II described this in the Mahāsiddhānta (c. 950 CE). [p.131]
Why: Aryabhata II described this in the Mahāsiddhānta (c. 950 CE). [p.131]
Q6. Every multiple of 32 is a multiple of 8.
True or false?
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Answer: True
Why: 32 = 8 × 4, so the multiples of 32 lie inside the multiples of 8. [p.134]
Why: 32 = 8 × 4, so the multiples of 32 lie inside the multiples of 8. [p.134]
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Frequently asked questions
How many practice questions are there for Class 8 Mathematics Chapter 5: Number Play?
45 questions (8 easy, 25 medium, 12 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 8 Mathematics syllabus, used by CBSE and many state boards.