Q. 13.8( 55 Votes )

Find the common factors of:

(a) 20 and 28 (b) 15 and 25

(c) 35 and 50 (d) 56 and 120

Answer :


When we find the factos of tow or more numbers, then some factors may be found in both the numbers, these are called common factors.

(a) 20 and 28


Factors of 20 = 1, 2, 4, 5, 10 and 20


Factors of 28 = 1, 2, 4, 7, 14 and 28


Common factors = 1, 2, 4


(b) 15 and 25


Factors of 15 = 1, 3, 5, 15


Factors of 25 = 1, 5, 25


Common factors = 1 and 5


(c) 35 and 50


Factors of 35 = 1, 5, 7, 35


Factors of 50 = 1, 2, 5, 10, 25, 50


Common factors = 1 and 5


(d) 56 and 120


Factors of 56 = 1, 2, 4, 7, 8, 14, 28 and 56


Factors of 120 = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120


Common factors = 1, 2, 4 and 8


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