Question

Find the HCF of $16\mathrm{and}20$.

Answer 1

A number, which divides the given number completely is called its factor.

Factors of $16=1,2,4,8,16.$

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

Common factors are $1,2\mathrm{and}4$

Highest common factors of $16\mathrm{and}20$ is $4$