What are all the greatest common factor of 16 and 44?

Answer 1

Factors of 16 are [2 2 2 2] Factors of 44 are [2 2 11]

Common factors are [2 2]

Answer is 2 * 2 = 4

Another way is to look at all factors.

All factors of 16 are {1 2 4 8 16}

all factors of 44 are {1 2 4 11 22 44}

Largest common factor is 4. ■