Question

1. Find the common factors of:
(a) 20 and 28
(b) 15 and 25 (c) 35 and 50 (d) 56 and 120
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
4. Write all the numbers less than 100 which are common multiples of 3 and 4.
5. Which of the following numbers are co-prime?
(a) 18 and 35 (b) 15 and 37 (c) 30 and 415
(d) 17 and 68 (e) 216 and 215 (f) 81 and 16
6. A number is divisible by both 5 and 12. By which other number will that number be
always divisible?
7. A number is divisible by 12. By what other numbers will that number be divisible?​

Answer 1

Answer:

1:

(a)

20=2*2*5

28=2*2*7

factors are 2*2

:4is factor

(b)

15=3*5

25=5*5

so 5is fctor

(c)

35=5*7

50=2*5*5

so factor are 5

(d)

56=2*2*2*7

120=2*2*2*3*5

factors are 2*2*2

=8

Answer 2

Step-by-step explanation:

1)4

2)5

3)5

4)8

hope it will help you