Question

What is the gcf of 35, 20,15

Answer 1

The gcf of 35, 20, 15 is 5

Answer 2

Prime factorisation of the numbers -

`\\ \sf \: 35 = 7 * \underline5 \\ \\ \sf \: 20 = \underline5 * 4 \\ \\ \sf \: 15 = 3 * \underline5 \\`

As, we can see that the 5 is common in the both three numbers. So,

GCF, greatest common factor (35, 20, 15) = 5