Estimate 851 - 465 by first rounding each number to the nearest ten.

Sure, here are the steps:

1. Round 851 to the nearest ten: 851 rounds down to 850 because the units digit (1) is less than 5.
2. Round 465 to the nearest ten: 465 rounds up to 470 because the units digit (5) is 5 or more.
3. Subtract the rounded numbers: 850 - 470 = 380.

So, the estimate of 851 - 465, when both numbers are rounded to the nearest ten, is 380.

Sure, here are the steps:

1. Round 851 to the nearest ten: 851 rounds down to 850 because the units digit (1) is less than 5.
2. Round 465 to the nearest ten: 465 rounds up to 470 because the units digit (5) is 5 or more.
3. Subtract the rounded numbers: 850 - 470 = 380.

So, the estimate of 851 - 465, when both numbers are rounded to the nearest ten, is 380.