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1 June, 08:09

It took Marty 42 minutes to write a book report then he spend 18 minutes correcting his report explain how you use mental math to find how long Marty spend on his book report

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  1. 1 June, 08:54
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    It took Marty 60 minute to finish the report mentally you add 42 plus 8 is 50 plus 10 (because 18 minus 8 is 18) then that equals 60
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