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Doubles + one
Adding numbers that are next to each other in counting order
| Question | Answer |
|---|---|
| 1+2 | 3 |
| 2+1 | 3 |
| 2+3 | 5 |
| 3+2 | 5 |
| 3+4 | 7 |
| 4+3 | 7 |
| 4+5 | 9 |
| 5+4 | 9 |
| 5+6 | 11 |
| 6+5 | 11 |
| 6+7 | 13 |
| 7+6 | 13 |
| 7+8 | 15 |
| 8+7 | 15 |
| 8+9 | 17 |
| 9+8 | 17 |
| 9+10 | 19 |
| 10+9 | 19 |