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

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mreijepatmat
1st he should have found the GCF of 60
2nd he should have found the GCF of 90, 

the GCF of 30 = 2x3x5

the GCF of 90 = 2x3²x5

So the GCF of 60 and 90 is 2x3x5 = 30

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