5th Grade Prime and Composite Numbers

Definition Prime Numbers:

A number which has only two factors, 1 and the number itself, is called the prime number.

For example, 2, 3, 5, 7, 11, 13, etc are prime numbers.

2 is the only even prime number. All other prime numbers are odd numbers.

Definition Composite Numbers:

A number which has more than two factors is called the composite number.

For example, 4, 6, 8, 9, 10, etc. are composite numbers.

1 is a unique number which is a factor of all the numbers. It is neither prime nor composite number.

Worksheet on 5th Grade Prime and Composite Numbers

1. Write down the prime numbers between the following.

(i) 2 and 25

(ii) 26 and 39

(iii) 40 and 60

(iv) 65 and 79

(v) 80 and 90

(vi) 91 and 100

Answer:

1. (i) 2, 3, 5, 7, 11, 13, 17, 19, 23

(ii) 29, 31, 37

(iii) 41, 43, 47, 53, 59

(iv) 67, 71, 73, 79

(v) 83, 89

(vi) 97

2. Write all the composite numbers between the following.

(i) 1 and 15

(ii) 20 and 35

(iii) 38 and 50

(iv) 52 and 65

(v) 70 and 85

(vi) 86 and 100

Answer:

2. Write down the prime numbers between the following.

(i) 4, 6, 8, 9, 10, 12, 14, 15

(ii) 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35

(iii) 38, 39, 40, 42, 44, 45, 46, 48, 49, 50

(iv) 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65

(v) 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85

(vi) 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100

5th Grade Math Problems

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