If you’re looking for a quicker way to do addition, use this chart to group numbers. Put your list of numbers on paper and then follow this example:
| Numbers | Pair | Add | Pair Again | Add | Total |
| 17 | (a) | ||||
| 151 | (d) | ||||
| 23 | (a) | (a) 23 + 17 = 40 | (e) | ||
| 24 | (b) | (b) 24 + 66 = 90 | (f) | (e) 190 + 90 = 280 | |
| 205 | (c) | (c) 205 + 75 = 280 | (f) | (f) 280 + 40 = 320 | 280 + 320 = 600 |
| 39 | (d) | (d) 39 + 151 = 190 | (e) | ||
| 75 | (c) | ||||
| 66 | (b) |