Question

Martin had 7 pounds of grape left, and he gave away 2/5 of them. Explain how to use compatible numbers to estimate the amount of grapes he gave away

Answer 1

$7 \times \dfrac{2}{5} = \dfrac{14}{5} \\ \\ \dfrac{14}{5} = 2 \dfrac{4}{5}$

Answer : 2 4/5 grams.

Hope this helps. - M

Answer 2

Answer:

2/5  is close to  1/2  , and it is easy to find  1/2  of 7 mentally. Half of 7 is 3.5, so Martin gave away about 3.5 pounds.

Step-by-step explanation:

 

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