Answer:
To estimate the answer to 57 × 12 by rounding each number to a significant figure, we need to follow these steps:
1. Round 57 to one significant figure. Since 57 has two significant figures, we round it to the nearest ten, which is 60.
2. Round 12 to one significant figure. Since 12 already has one significant figure, we don't need to make any changes.
3. Multiply the rounded numbers: 60 × 12 = 720.
Therefore, by rounding 57 to 60 and 12 to 10, the estimated answer to 57 × 12 is 720.
Explanation: