A:879
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.
680 + 440 = 1120
439 + 71 = 439 + 1 + 70 = 440 + 70 = 510. Who needs a ball park estimate when the exact answer is just as easy to find?
440
440 + 440 + 440 + 440 + 440 + 440 = 2,640
400
439 rounded to the nearest ten is 440.
The answer is 2640. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
439 + 746 = 1185
87794 + 39357 + 180 + 439 = 127,770
There are infinitely many possible answers. 439 + 1 is one possibility. 22 x 20 = 440
1 fourth of a mile is 440 yards