Add and Subtract Whole Numbers
Quiz yourself by guessing what should be in
each of the black rectangles below before clicking
on it to display the answer.
Help
| vocabulary |  |
|
| definition | |
|
| Sum | The answer to an addition problem |
| Difference | The answer to a subtraction problem |
| Estimate | to find an answer close to an exact answer |
| Round | To replace a number with a number that tells about how many or how much |
| Front - end estimation | When you add or subtract the front digit of each number to get an estimation |
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