Fern rounded to the nearest ten to estimate 548-132. She subtracted

540-130=410. Is Fern's estimate correct? Explain.

No.

548 rounded to the nearest 10 is not 540.

550

To determine if Fern's estimate is correct, let's first analyze her rounding process.

Fern rounded both 548 and 132 to the nearest ten. Rounding 548 to the nearest ten gives us 550, as it is closer to 550 than to 540 (the next lower multiple of ten). Similarly, rounding 132 to the nearest ten gives us 130, as it is closer to 130 than to 140 (the next higher multiple of ten).

Fern then subtracted her rounded estimates: 550 - 130 = 410.

To verify if Fern's estimate is correct, we need to subtract the actual numbers rather than the rounded numbers. So let's calculate 548 - 132.

548 - 132 = 416.

Comparing the actual answer (416) with Fern's estimate (410), we can see that her estimate is not correct. The correct answer is 416, not 410.

Therefore, Fern's estimate is incorrect due to the rounding errors she made when estimating both numbers.