Missing number
| Description: | through 20 |
| Category: | Math |
| Created by: | dstephens on 2007-09-24 |
| Stack ID: | 92978 |
| Flap 1 | Flap 2 |
| 1,2,3,4,____,6,7,8 | 5 |
| 5,6,____,8,9 | 7 |
| 6,7,____,9,10 | 8 |
| 13,____,15,16 | 14 |
| 10,____,12,13 | 11 |
| 15,16,____,18,19 | 17 |
| 17,18,____,20 | 19 |
| 4,5,____,7,8 | 6 |
| 12,13,____,15,16 | 14 |
| 8,9,____,11,12 | 10 |
| 5,6,____,8,9 | 7 |
| 12,13,14,____,16,17 | 15 |
| 2,3,____,5,6 | 4 |
| 7,8,____,10 | 9 |
| 6,5,____,3,2 | 4 |
| 9,8,____,6,5 | 7 |
| 12,11,____,9,8 | 10 |
| 17,16,____,14,13 | 15 |
| 13,14,____,16,17 | 15 |
| 10,9,8,____,6,5 | 7 |
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