| A | B |
| Round | Find a value close to the original number but easier to work with |
| Estimate | Close to or about the same as the original number, usually followed by all zeros |
| Estimate the sum of 365 and 247 | 600 |
| Estimate the difference of 590 and 107 | 500 |
| Estimate the sum of .72 and .15 | .90 |
| Estimate the difference of 5.63 and 3.09 | 3.00 |
| Round 8.570 to the nearest tenth | 8.6 |
| Round .35 to the nearest tenth | .4 |
| Round .6054 to the nearest hundredth | .61 |
| Round 11.7706 to the nearest whole number | 12 |