What is the gcf of 16 20 24

Find the prime factorization of each number.

(Use divisibility rules, dividing up the number until you can't anymore.)

16 = 2 * 2 * 2 * 2

20 = 2 * 2 * 5

24 = 2 * 2 * 2 * 3

Multiply together any factors that they all share

2 * 2 = 4