Question

Xiao's teacher asked him to rewrite the sum of 60 + 90 as the product of the GCF of the two numbers and a sum. Xiao wrote 3(20 + 30). what mistake did Xiao make? How should he have written the sum?

Answer 1

he didnt use gfc he used multiples of lgcf

Answer 2

The mistake: GCF (60:90) isn't 3 just 30

Correct answer: 60+90= 30 ( 2+3)

Hope this helps!