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19 July, 11:38

It took Marty 42 minutes to write a book report. Then he spent 18 minutes correcting his report. Explain how you can use mental math to find how lonc Marty spent on his book report.

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  1. 19 July, 14:30
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    Take the 2 from 42 and add that to 18 so now u have 40 plus twenty which is of course 60
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