How do I find an estimate for the sum of the numbers 622,78,81,111, to the nearest 10.?
2 Answers
Nov 4, 2017
Explanation:
When we're rounding any number to the nearest ten, we'll want to first find the two tens that it's in between.
For our problem:
622 is between620 and630 78 is between70 and80 81 is between80 and90 111 is between110 and120
Next, we want to find which of those tens each number is closest to. We'll round the number to that particular ten.
622 is closer to620 than630 , so we round it to620 78 is closer to80 than70 , so we round it to80 81 is closer to80 than90 , so we round it to80 111 is closer to110 than120 , so we round it to110
Finally, we can use our rounded addends to find an estimated sum:
Nov 4, 2017
Explanation:
If a number is to be rounded to the nearest
To decide whether to round up or down, look at the digit in the units place. If it is