What is the sum of the numbers as the product of their GCF and another sum?

Question

44 + 40 =

13 + 52 =

15 + 81 =



64 + 28 =

Answer 1

44 +40 = 84 = 4(21) 4 is the GCF of 44 and 40

13+52 = 65 = 13(5) 13 is the GCF of 13 and 52

15+81 = 96 = 3(32), 3 is the GCF of 15 and 81

64+28 = 92 = 4(23), 4 is the GCF of 64 and 28