Question

2. List the common factors and determine the HCF.
b) 14 and 24
a) 15 and 35
c) 9 and 21
d) 10 and 16
e) 12 and 18
f) 36 and 14.​

Answer 1

The factors of 12 are : 1, 2, 3, 4, 6, 12. The factors of 15 are : 1, 3, 5, 15. 1 and 3 are the only common factors (numbers which are factors of both 12 and 15). Therefore, the highest common factor of 12 and 15 is 3.

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