To estimate the amount of grapes Martin gave away using compatible numbers, you can first round the numbers to make the calculation easier. In this case, we'll round the 7 pounds of grapes to a compatible number that's easier to work with.
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Identify the original number of grapes: Martin has 7 pounds of grapes.
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Determine the fraction he gave away: Martin gave away \( \frac{2}{5} \) of his grapes.
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Use compatible numbers to estimate: Instead of using 7 directly, we can round it to a nearby number that is easier to work with, like 10.
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Calculate \( \frac{2}{5} \) of this rounded number:
- Find \( \frac{2}{5} \) of 10:
- \( \frac{2}{5} \) of 10 = 4.
Thus, using the compatible number of 10, we estimate that Martin gave away about 4 pounds of grapes.
This method of rounding to compatible numbers helps simplify the calculation while still providing a reasonable estimate of the amount given away.