Notice that each of the three numbers is rather close to 9,000.
The estimated sum is 27,000.
100 That is an estimate.
How do you make a ballpark estimate of 7201 plus 6988?
estimate is to round up
919
1330 plus 900
1720
70
10.4
332
5.5
The estimate is 1.
The ballpark estimate for 439 plus 71 can be simplified by rounding both numbers. Rounding 439 to 440 and 71 to 70 gives us 440 plus 70, which equals 510. Therefore, the ballpark estimate for 439 plus 71 is approximately 510.