Question

Find the common factors of :
(a) 4, 8 and 12
(b) 5, 15 and 25

Answer 1

(a)factors of 4 = 1,2,4
factors of 8 = 1,2,4,8
factors of 12 = 1,2,3,4,6,12
common factors = 1,2,4

(b) factors of 5 = 1,5
factors of 15 = 1,3,5
factors of 25 = 1,5,25
common factors = 1,5

Answer 2

Question (a):

Find the factors of 4:

4 = 1 x 4

4 = 2 x 2

Factors of 4 are 1, 2 and 4

Find the factors of 8:

8 = 1 x 8

8 = 2 x 4

Factors of 8 are 1, 2, 4 and 8

Find the factors of 12

12 = 1 x 12

12 = 2 x 6

12 = 3 x 4

Factors of 12 are 1, 2, 3, 4, 6 and 12

Find the common factors:

Factors of 4 = 1, 2 and 4

Factors of 8 = 1, 2, 4 and 8

Factors of 12 = 1, 2, 3, 4, 6 and 12

Common factors are 1, 2 and 4

Question (b):

Find the factors of 5:

5 = 1 x 5

Factors of 5 are 1 and 5

Find the factors of 15:

15 = 1 x 15

15 = 3 x 5

Factors of 15 are 1, 3, 5 and 15

Find the factors of 25:

25 = 1 x 25

25 = 5 x 5

Factors of 25 are 1, 5 and 25

Find the common factors:

Factors of 5 are 1 and 5

Factors of 15 are 1, 3, 5 and 15

Factors of 25 are 1, 5 and 25

Common factors are 1 an 5