It means to make an intelligent guess at an approximate answer rather than calculate the exact value.
For example, to estimate 1989 + 6019,
I would round 1989 to 2000 and 6019 to 6000 and so the sum simplifies to 2000 + 6000.
And that is 8000.
[The exact answer is 8008.]
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an estimating technique in which the front digits of the addends are added and then the sum is adjusted for a closer estimate
Guessing the answer in a division problem.
sum mean to add and differene mean to subtrat
When estimating the sum of 48765 and 9221, you can round each number to the nearest thousand. 48765 rounds to 49000, and 9221 rounds to 9000. Adding these rounded numbers gives you an estimated sum of 58000. To estimate the difference, you can round 48765 to 49000 and 9221 to 9000. Subtracting these rounded numbers gives you an estimated difference of 4000.
Sum is an answer to an addition problem.