Round to the nearest ten to estimate the difference of 789-371

420

Step-by-step explanation:

Subtract the numbers

789 - 371

Sum:

418

Remember, we did not necessarily round up or down, but to the ten that is nearest to 418.

First, 418 rounded to the nearest ten is

420

When rounding to the nearest ten, like we did with 418 above, we use the following rules:

A) We round the number up to the nearest ten if the last digit in the number is 5, 6, 7, 8, or 9.

B) We round the number down to the nearest ten if the last digit in the number is 1, 2, 3, or 4.

C) If the last digit is 0, then we do not have to do any rounding, because it is already to the ten.

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step-by-step explanation: