Rewrite 72 + 81 as two factors. One factor is the GCF and the other is the sum of two numbers that do not have a common factor. Show your work. using the gcf which is 9

-  72 + 81 = 9 * 17:-

Find the GCF of 72 and 81 by first  writing out the prime factors:-

72 = 2*2*2*3*3

81 = 3*3*3

Picking out common factors  we get  GCF = 3*3 = 9

So 72 + 81 =  9(8 + 9)   (using the distributive law)

= 9 * 17

=your mom

Step-by-step explanation:

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