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

User Luca Ditrimma
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Xiao was mistake because 3(20+30) still can divide by 10. The sum is 30(2+3)
User BriiC
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