An estimate is a guess. But an educated guess
For example: 5. 211 + 4.79
Right away you can estimate that the answer is around 10.
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i would say they way to get the ballpark estimate is by taking the number. and see what is the estimate for that number and then you take that estimated number and then add to get your answer .
A ballpark estimate is a very rough approximation of a number, figure, or calculation.
Estimate
place value
The whole number is the 16. But if you estimate it the answer would be 17.