Question

find the greatest common factor (gcf). 21 and 30

Explanation:

Step1: Factorize 21 and 30

Factorize \(21\): \(21 = 3\times7\)
Factorize \(30\): \(30 = 2\times3\times5\)

Step2: Identify common factors

The common factor of \(21\) and \(30\) is \(3\). Since it is the only common factor, it is also the greatest common factor.

Answer:

3