Question

Please, with work, find the prime factorization of 60 and 140?

Answer 1

Prime Factors of 60:   2,3, and 5
Prime Factors of 140:  2,5 and 7
All mental math no work needed.

Answer 2

60: 2, 3, 5
140: 2, 5, 7
A prime number can only be divided by 1 or itself
So pick the factor that can only be divided by 1 or itself?