Worksheet on Prime Numbers Between 1 to 100 for Class 1

Solved Questions on Prime Numbers

1. Which of the following is a prime number?

a) 10
b) 17
c) 24
d) 33

Answer: b) 17

Explanation: 17 is a prime number. It has exactly two divisors, 1 and 17, and is not divisible by any other positive integer.

2. Which of the following is not a prime number?

a) 2
b) 3
c) 5
d) 6

Answer: d) 6

Explanation: 6 is not a prime number. It has more than two divisors, namely 1, 2, 3, and 6.

3. Which of the following is a composite number?

a) 11
b) 13
c) 15
d) 19

Answer: c) 15

Explanation: 15 is a composite number. It is divisible by 1, 3, 5, and 15.

4. What is the smallest prime number greater than 10?

a) 11
b) 13
c) 15
d) 17

Answer: a) 11

Explanation: The smallest prime number greater than 10 is 11, which has exactly two positive divisors (namely, 1 and 11).

5. What is the largest prime number less than 20?

a) 17
b) 19
c) 21
d) 23

Answer: b) 19

Explanation: The largest prime number less than 20 is 19, which has exactly two positive divisors (namely, 1 and 19).

Practice Questions on Prime Numbers

1. Which of the following is not a prime number?

a) 23
b) 27
c) 29
d) 31

Answer: b) 27

2. What is the sum of the first 10 prime numbers?

a) 68
b) 129
c) 184
d) 223

Answer: b) 129

3. What is the only even prime number?

a) 1
b) 2
c) 3
d) 4

Answer: b) 2

4. How many prime numbers are there between 50 and 70?

a) 3
b) 4
c) 5
d) 6

Answer: b) 4 (53, 59, 61, 67)

5. What is the sum of the prime numbers less than 10?

a) 17
b) 26
c) 37
d) 50

Answer: a) 17

6. Which of the following numbers is not prime?

a) 19² - 2
b) 27² - 2
c) 31² - 2
d) 37² - 2

Answer: c) 31² - 2

7. What is the odd prime number?

a) 13
b) 14
c) 15
d) 16

Answer: a) 13

8. What is the next prime number after 89?

a) 91
b) 93
c) 97
d) 99

Answer: c) 97

9. Which of the following is a composite number?

a) 31
b) 37
c) 41
d) 49

Answer: d) 49

10. What is the next prime number after 11?

a) 10
b) 12
c) 13
d) 14

Answer: c) 13