Page 69 - Maths Class 04

If the remainder is zero, both divisor and quotient are the factors of the
dividend.

Let us find the factors of 30.

30 ÷ 1 = 30

30 ÷ 2 = 15

30 ÷ 3 = 10

30 ÷ 4 = 7, leaves 2 as remainder

30 ÷ 5 = 6

30 ÷ 6 = 5

30 ÷ 7 = 4, leaves 2 as remainder

30 ÷ 8 = 3, leaves 6 as remainder

30 ÷ 9 = 3, leaves 3 as remainder

30 ÷ 10 = 3

30 ÷ 15 = 2

30 ÷ 30 = 1

Here, we can see that 4, 7, 8, 9 are not the factors of 30 as they do not
divide exactly. Therefore, the factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30.

Practice - 5.1
Practice - 5.1
Practice - 5.1
Practice - 5.1
1. Find the factors of the following numbers using multiplication.

a. 61 b. 77 c. 80 d. 100 e. 40

2. Find the factors of the following numbers using division.

a. 108 b. 56 c. 144 d. 89 e. 50

3. Find out the products of the following pairs of numbers and find factors of
the products obtained.

a. 8, 12 b. 12, 15 c. 14, 12 d. 11, 5

4. Encircle the prime numbers.

4, 2, 6, 3, 18, 17, 20, 19, 23, 28, 30, 29, 35,

41, 66, 37, 53, 46, 43, 91, 93, 97, 101, 13, 7

Mathematics-4 69