A carpenter needs to order 20 boxes of nails. Each box costs $3.89. Approximately how much will the carpenter pay for the nails?

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Multiple Choice

A carpenter needs to order 20 boxes of nails. Each box costs $3.89. Approximately how much will the carpenter pay for the nails?

Explanation:
Rounding and multiplication help estimate costs. Each box costs about 3.89 dollars, so for 20 boxes you estimate using 4 dollars per box. 20 × 4 = 80. Since 3.89 is very close to 4, the total is about $80. The exact total is 20 × 3.89 = 77.80, which is also near 80, so 80 is the best estimate. The other totals are farther from the actual total, implying much cheaper or more expensive per box.

Rounding and multiplication help estimate costs. Each box costs about 3.89 dollars, so for 20 boxes you estimate using 4 dollars per box. 20 × 4 = 80. Since 3.89 is very close to 4, the total is about $80. The exact total is 20 × 3.89 = 77.80, which is also near 80, so 80 is the best estimate. The other totals are farther from the actual total, implying much cheaper or more expensive per box.

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