Posted by **leya** on Thursday, May 24, 2012 at 9:41pm.

Gustav is using front-end estimation. In estimating seventy-two point nine three minus thirty-two point zero seven, Gustav follows the steps below. Where did he go wrong?

Step 1: seventy-two minus thirty-two equals forty

Step 2: zero point nine three minus zero point zero seven is approximately equal to one

Step 3:forty minus one equals thirty-nine

Step 4: seventy-two point nine three minus thirty-two point zero seven is approximately equal to thirty-nine

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