Asked by Godly

how could you use the gcf and the distributive property to express the sum of 63 + 81?
a 7(9 + 13)
b 7(9 + 3)
c 3(21 + 27)
d 9(7 + 9)
Answered by Bosnian
The GCF of 63 and 81 is 9, so you can use that as the factor outside of the parentheses.

Divide both numbers by 9.

63 / 9 = 7

81 / 9 = 9

Write the sum as:

9 ( 7 + 9 )

Check result.

9 ( 7 + 9 ) = 9 • 7 + 9 • 9 = 63 + 81
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