Question

Write the sum of the numbers as the product of gcf. 15+81

Answer 1

Factors of 81: 1, 3, 9, 27, 81

Factors of 15: 1, 3, 5, 15

greatest common factor: 3

15 = 3*5

81 = 3*27

then:

15 + 81 = 3*5 + 3*27 = 3(5 + 27)