What is the gcf of 68 24 and 12?

Answer 1

4.

Express each number in its prime composition in power form and take the lowest power of each prime across all the numbers (if a prime does not appear in any number, it does not appear in the gcf):

68 = 22 x 17

24 = 23 x 3

12 = 22 x 3

gcf = 22 = 4