The DAV Class 5 Maths Book Solutions Pdf and **DAV Class 5 Maths Chapter 3 Worksheet 7** Solutions of Multiples and Factors offer comprehensive answers to textbook questions.

## DAV Class 5 Maths Ch 3 Worksheet 7 Solutions

Question 1.

Fill in the blanks.

(a) Is 1 a prime number? ______ (Yes/No)

Solution:

No, 1 is neither prime nor composite.

(b) Write the smallest-

(i) Prime number : _______

(ii) Composite number : _______

(iii) Odd prime : ________

(iv) Even composite : ________

(v) Odd composite : ________

Solution:

(i) 2

(ii) 4

(iii) 3

(iv) 4

(v) 9

Question 2.

Which of the following are prime numbers?

10, 12, 15, 17, 19, 21, 25, 33, 35, 37

Solution:

17, 19, 37

Question 3.

Which of the following are composite numbers?

14, 15, 19, 20, 24, 27, 29, 30, 32

Solution:

14, 15, 20, 24, 27, 30, 32

Question 4.

Write all the prime numbers between 20 and 30.

Solution:

23, 29 have 2 factors: 1 and itself.

Question 5.

Write all the composite numbers between 40 and 50.

Solution:

42, 44, 45, 46, 48, 49

**DAV Class 5 Maths Chapter 3 Worksheet 7 Notes**

- Prime number: A number with exactly two distinct factors (1 and the number itself) is called a Prime number.

For example, 2, 3, 5, 7, 11, 13, 17 … are prime numbers.

Factors of 2 = 1, 2.

Factors of 3 = 1, 3, and so on. - Composite number: A number with more than two factors is called a Composite Number.

For example 4, 6, 8, 10, 12, 14, 15, 16, 18, 20, 21,…… are composite numbers. - 1 is neither a prime nor a composite number.
- The smallest prime number is 2.
- The smallest composite number is 4.