Find the common factors of:
(a) 20 and 28 (b) 15 and 25 (c) 35 and 50 (d) 56 and 120
(a) 20 and 28
Factors of 20 are 1, 2, 4, 5, 10 and 20.
Factors of 28 are 1, 2, 4, 7, 14 and 28.
Therefore, common factors of 20 and 28 are 1, 2 and 4.
(b) 15 and 25
Factors of 15 are 1, 3, 5, and 15.
Factors of 25 are 1, 5 and 25.
Therefore, common factors of 15 and 25 are 1 and 5.
(c) 35 and 50
Factors of 35 are 1, 5, 7 and 35.
Factors of 50 are 1, 2, 5, 10, 25 and 50.
Therefore, common factors of 35 and 50 are 1 and 5.
(d) 56 and 120
Factors of 56 are 1, 2, 4, 7, 8, 14, 28 and 56.
Factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60 and 120.
Therefore, common factors of 56 and 120 are 1, 2, 4 and 8.
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