Question

Find the highest common factor (HCF) of 30 and 45

Answer 1

15.

Explanation:

HCF is also called GCD. So, you divide both numbers with a common number that can divide both numbers at the same time without a remainder.

3 30 45

5 10 15

2 3

3 × 5 = 15

Answer 2

The highest common factor of 30 and 45 is 15.

Explanation:

factors of 30 = 1, 2, 3, 4, 5, 6, 10, 15, 30 ; factors of 45 are = 1, 3, 5, 9, 15, 45)

Greatest common factor is 15