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If used compensation to find product of 37x4 first she found 40x4=160 then adjusted that product by adding 3 groups of 4 to get her final answer 172. What did she do incorrectly?
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If used compensation to find product of 37x4 first she found 40x4=160 then adjusted that product by adding 3 groups of 4 to get her final answer 172. What did she do incorrectly?

User Sebastian Rittau
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1 Answer

4 votes
She added, but she added to 37, so she should have subtracted 3 groups of 4 instead of adding.
User Clementina
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