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Prime Time — Practice Quiz

CBSE · Class 6 · Mathematics

Try a 4-question quiz on Prime Time for CBSE Class 6 Mathematics: tap an answer to check it and see why. 41 questions in the full chapter test.

41 questions60 flashcards7 formulas & key relations5 concepts

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Quick Quiz: Prime Time

0/4

Tap an answer to check it instantly. No sign-up needed for these 4.

1

What is the prime factorization of 72?

2

Find the HCF (Highest Common Factor) of 24 and 36.

3

How many prime numbers are there between 10 and 30?

4

What is the LCM (Least Common Multiple) of 12 and 18?

41 Questions·
multiple choicemultiple correcttrue falsematchingorderingtext answer

Sample Questions

1multiple correct

Which numbers are factors of 36?

Show answer

4, 6, 9, 12

Factors of 36 are numbers that divide 36 exactly. Let's check: 36 ÷ 4 = 9 ✓, 36 ÷ 6 = 6 ✓, 36 ÷ 8 = 4.5 ✗, 36 ÷ 9 = 4 ✓, 36 ÷ 12 = 3 ✓, 36 ÷ 15 = 2.4 ✗. So factors are 4, 6, 9, and 12.

2true false

Are 15 and 28 co-prime numbers?

Show answer

True

Two numbers are co-prime if their HCF is 1. Prime factorization: 15 = 3 × 5, 28 = 2² × 7. Since 15 and 28 have no common prime factors, they are co-prime. We can verify: factors of 15 are 1, 3, 5, 15 and factors of 28 are 1, 2, 4, 7, 14, 28. Only common factor is 1.

3multiple correct

Which of these numbers are composite?

Show answer

21, 27, 33

Composite numbers have more than 2 factors. Let's check: 21 = 3 × 7 (factors: 1, 3, 7, 21) - composite. 23 has only factors 1, 23 - prime. 27 = 3³ (factors: 1, 3, 9, 27) - composite. 29 has only factors 1, 29 - prime. 33 = 3 × 11 (factors: 1, 3, 11, 33) - composite.

4true false

If a number is divisible by both 4 and 6, it must be divisible by 24.

Show answer

False

This is false. If a number is divisible by both 4 and 6, it must be divisible by their LCM, not their product. LCM of 4 and 6 = 12 (since 4 = 2², 6 = 2 × 3, so LCM = 2² × 3 = 12). For example, 12 is divisible by both 4 and 6, but not by 24.

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Frequently Asked Questions

What are the important topics in Prime Time for CBSE Class 6 Mathematics?
Key topics in Prime Time include Factors, Common Multiples, and Common Factors, Prime Numbers and Composite Numbers, The Sieve of Eratosthenes, Co-prime Numbers. Study these first, then practise questions on each for Class 6 exams.
How many practice questions are there for Prime Time?
There are 41 questions on Prime Time. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

Sources & Official References

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

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