In Class 6 Maths, Chapter 5: Prime Time, students will revise important ideas about prime numbers, composite numbers, factors, multiples, LCM, and HCF. They will also solve multiple-choice questions with four options and answers to check your understanding of key concepts and examples. Practice fill-in-the-blank questions that is going to test their memory of definitions and important details.
Class 6 Maths Chapter 5 MCQ Prime Time
Question 1: Which of the following is a prime number?
a) 9
b) 15
c) 7
d) 21
Answer:
c) 7
Question 2: Which of these numbers is composite?
a) 2
b) 3
c) 11
d) 12
Answer:
d) 12
Question 3: What do we call numbers that have only two factors, 1 and the number itself?
a) Composite numbers
b) Prime numbers
c) Even numbers
d) Odd numbers
Answer:
b) Prime numbers
Question 4: What is the smallest prime number?
a) 0
b) 1
c) 2
d) 3
Answer:
c) 2
Question 5: What is the only even prime number?
a) 2
b) 4
c) 6
d) 8
Answer:
a) 2
Question 6: Which of the following numbers is neither prime nor composite?
a) 0
b) 1
c) 2
d) 3
Answer:
b) 1
Question 7: Which of the following is NOT a prime number?
a) 29
b) 37
c) 51
d) 41
Answer:
c) 51
Question 8: Which of these is a pair of twin primes?
a) 5 and 7
b) 11 and 13
c) 17 and 19
d) 23 and 25
Answer:
c) 17 and 19
Question 9: What do we call numbers that have more than two factors?
a) Prime numbers
b) Composite numbers
c) Twin primes
d) Co-primes
Answer:
b) Composite numbers
Question 10: Which of the following is a factor of every number?
a) 0
b) 1
c) 2
d) 10
Answer:
b) 1
Question 11: Which of the following is a common factor of 12 and 18?
a) 3
b) 7
c) 11
d) 19
Answer:
a) 3
Question 12: Which of these is a common multiple of 4 and 6?
a) 8
b) 10
c) 12
d) 14
Answer:
c) 12
Question 13: What do we call numbers that have no common factor other than 1?
a) Prime numbers
b) Composite numbers
c) Co-prime numbers
d) Even numbers
Answer:
c) Co-prime numbers
Question 14: Which of the following pairs are co-prime?
a) 14 and 21
b) 18 and 35
c) 12 and 18
d) 20 and 50
Answer:
b) 18 and 35
Question 15: What is the prime factorisation of 36?
a) 2 × 2 × 3 × 3
b) 2 × 6 × 3
c) 9 × 4
d) 12 × 3
Answer:
a) 2 × 2 × 3 × 3
Question 16: Which of the following is a prime factor of 84?
a) 4
b) 6
c) 7
d) 9
Answer:
c) 7
Question 17: Which number has prime factorisation 2 × 3 × 5?
a) 25
b) 30
c) 45
d) 60
Answer:
b) 30
Question 18: If the prime factors of a number are 2, 2, 2, and 5, what is the number?
a) 20
b) 30
c) 40
d) 80
Answer:
c) 40
Question 19: What is the least common multiple (LCM) of 6 and 8?
a) 12
b) 18
c) 24
d) 36
Answer:
c) 24
Question 20: What is the greatest common factor (GCF) of 24 and 36?
a) 6
b) 8
c) 12
d) 18
Answer:
c) 12
Question 21: Which of the following numbers is divisible by 2, 4, and 8?
a) 14
b) 16
c) 20
d) 24
Answer:
b) 16
Question 22: A number divisible by 5 must end in ___.
a) 0 or 5
b) 2 or 4
c) 6 or 8
d) 1 or 9
Answer:
a) 0 or 5
Question 23: Which of the following is a perfect number?
a) 6
b) 9
c) 12
d) 15
Answer:
a) 6
Question 24: Which test can be used to check divisibility by 2?
a) The number ends with 0, 2, 4, 6, or 8
b) The number ends with 0 or 5
c) The number is odd
d) The number ends with 1 or 9
Answer:
a) The number ends with 0, 2, 4, 6, or 8
Question 25: Which is the smallest prime number greater than 50?
a) 51
b) 53
c) 55
d) 57
Answer:
b) 53
Question 26: Which of these numbers is NOT divisible by 10?
a) 120
b) 150
c) 175
d) 200
Answer:
c) 175
Question 27: Which of the following numbers is divisible by 4?
a) 22
b) 28
c) 35
d) 42
Answer:
b) 28
Question 28: What is the smallest prime factor of 91?
a) 7
b) 11
c) 13
d) 91
Answer:
a) 7
Question 29: Which two prime numbers are called twin primes?
a) Prime numbers with difference 2
b) Prime numbers with difference 5
c) Prime numbers with difference 10
d) Prime numbers with difference 1
Answer:
a) Prime numbers with difference 2
Question 30: Which of these is the prime factorisation of 72?
a) 2 × 2 × 2 × 3 × 3
b) 2 × 6 × 6
c) 9 × 8
d) 12 × 6
Answer:
a) 2 × 2 × 2 × 3 × 3
Question 31: Which divisibility rule states that a number is divisible if the last digit is 0?
a) Divisibility by 2
b) Divisibility by 5
c) Divisibility by 10
d) Divisibility by 4
Answer:
c) Divisibility by 10
Question 32: Which is the smallest composite number?
a) 2
b) 3
c) 4
d) 5
Answer:
c) 4
Question 33: What is the LCM of 9 and 12?
a) 18
b) 24
c) 27
d) 36
Answer:
b) 36
Question 34: What is the HCF of 20 and 28?
a) 2
b) 4
c) 6
d) 8
Answer:
b) 4
Question 35: Which of the following numbers is divisible by both 2 and 3?
a) 12
b) 15
c) 25
d) 35
Answer:
a) 12
Fill in the blanks on Prime Time Class 6
1. Numbers that have exactly two factors, 1 and itself, are called ___ numbers.
Answer:
prime
2. Numbers that have more than two factors are called ___ numbers.
Answer:
composite
3. The smallest prime number is ___.
Answer:
2
4. The only even prime number is ___.
Answer:
2
5. The number ___ is neither prime nor composite.
Answer:
1
6. The smallest composite number is ___.
Answer:
4
7. The factors of every number always include ___ and the number itself.
Answer:
1
8. Two prime numbers that differ by 2 are called ___ primes.
Answer:
twin
9. Numbers that have no common factor other than 1 are called ___.
Answer:
co-primes
10. The process of expressing a number as a product of prime numbers is called ___.
Answer:
prime factorisation
11. The prime factorisation of 36 is 2 × 2 × ___ × 3.
Answer:
3
12. The least common multiple (LCM) of 6 and 8 is ___.
Answer:
24
13. The greatest common factor (GCF) of 24 and 36 is ___.
Answer:
12
14. A number is divisible by 2 if it ends in ___.
Answer:
0, 2, 4, 6, or 8
15. A number is divisible by 5 if it ends in ___.
Answer:
0 or 5
16. A number is divisible by 10 if its last digit is ___.
Answer:
0
17. The smallest prime factor of 91 is ___.
Answer:
7
18. The number ___ is a perfect number because the sum of its factors (excluding itself) equals the number.
Answer:
6
19. The LCM of 9 and 12 is ___.
Answer:
36
20. The HCF of 20 and 28 is ___.
Answer:
4
