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17 November, 12:39

Martin had 7 pounds of grapes left and gave away 2/5 of them explain how to use comparable numbers to estimate the amount of grapes he gave away

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  1. 17 November, 16:00
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    See below

    Step-by-step explanation:

    Compatible numbers are numbers that are easy to use in mental arithmetic.

    Martin gave away ⅖ of 7 lb of grapes, so the amount he gave away was

    ⅖ * 7 lb

    ⅖ is close to ²/₄ (½), and it is easy to take half of something mentally.

    Half of 7 is about 3, so Martin gave away about 3 lb of grapes (the exact answer is 2.8 lb).
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