Question

EXERCISE 3.4
1. Find the common factors of:
(a) 20 and 28
(b) 15 and 25 (c) 35 and 50 (d) 56 and 130
2. Find the common factors of:
(a) 4,8 and 12 (b) 5,15 and 25
3. Find first three common multiples of:
(a) 6 and 8
(b) 12 and 18​

Answer 1

Answer:

Common factors of 5,15 and 20 is 5

48 and 12 is 2

6,8 is 2

12,18 is 2

15,25is 5

35 and 50 is also 5

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Answer 2

Answer:

(a) 20=2x2x5

28=2x2x7

common factor =2x2=4

(b) 15=3x5

25=5x5

common factor =5

(c) 35=5x7

50=2x5x5

common factor =5

(d)

56=2x2x2x7

130=2x5x13

common factor =2

2.

4=2x2

8=2x2x2

12=2x2x3

common factor =2x2=4

(b)

5=5x5

15=3x5

25=5x5

common factor =5

3

(a) first three common multiple of 6and8=24,48,72

(b)

12 and 18

=36,72,108

l think it is helpful for you