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

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