Eoin plans to purchase 6.50 pounds of cheese that costs $4.75 per pound. He used the following steps to estimate the cost.Step 1: Round 6.50 pounds up to 7.Step 2: Round $4.75 up to $5.00.Step 3: Multiply 5 by 7 to get 35.Step 4: Conclude that the cost will be just over $35.00. In which step does Eoin make a mistake?

The rounded values in steps 1 and 2 are reasonable, and multiplying pounds by dollars per pound is the right operation. But the actual cost is 6.50 × $4.75 = $30.875, which is under $35. The estimate of $35 is an upper estimate, so in step 4 Eoin should have concluded that the cost would be under $35.00.

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