Question

Find the common factors of:
(a) 20 and 28 (b) 15 and 25 (c) 35 and 50 (d) 56 and 120
Find the common factors of:
(a) 4,8 and 12 (b) 5,15 and 25
Find first three common multiples of:
(a) 6 and 8 (b) 12 and 18
Write all the numbers less than 100 which are common multiples of 3 and 4.
Which of the following numbers are co-prime?
Ya) 18 and 35 (b) 15 and 37 (c) 30 and 415
(d) 17 and 68 (e) 216 and 215 (f) 81 and 16
A number is divisible by both 5 and 12. By which other number will that number be
always divisible?
A number is divisible by 12. By what other numbers will that number be divisible?​

Answer 1

common factor of 20 and 28 is 4

20=4×5

28=4×7

common factor of 15 and 25 is 5

15=5×3

25=5×5

common factor of 35 and 50 is 5

35=5×7

50=5×10

common factor of 56 and 120

56=8×7

120=8×15

common factor of 4,8 and 12 is 4

4=4×1

8=4×2

12=4×3

common factor of 5,15 and 25 is 5

5=5×1

15=5×3

25=5×5

Answer 2

Step-by-step explanation:

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