Question

In class, we used associative property to show that when 6 is a factor, then 2 and 3 are factors, because 6=2x3. Use the fact that 10=5x2 to show that 2 and 5 are factors of 70, 80, and 90.

Answer 1

70=5x14
70=2x35

80=5x16
80=2x40

90=5x18
90=2x45