Answer:
420
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.