Question -
Answer -
(a) 20 and 28
1, 2, 4, 5, 10 and 20 are factors of 20
1, 2, 4, 7, 14 and 28 are factors of 28
Common factors = 1, 2, 4
(b) 15 and 25
1, 3, 5 and 15 are factors of 15
1, 5 and 25 are factors of 25
Common factors = 1, 5
(c) 35 and 50
1, 5, 7 and 35 are factors of 35
1, 2, 5, 10, 25 and 50 are factors of 50
Common factors = 1, 5
(d) 56 and 120
1, 2, 4, 7, 8, 14, 28 and 56 are factors of 56
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60 and 120 are factors of 120
Common factors = 1, 2, 4, 8