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

The first step is correct. 37 can be approximated to 40 so that multiplication becomes easier. The second step is also correct. 3 groups of 4 is 12. The mistake is in adding the product to 160. 37 was approximated to 40 and so the product is more than the actual answer. The correct answer should naturally be less than 160. To find the correct answer, we should subtract 12 from 160. So the right answer is 160 - 12 = 148.

Dcups i think