| Problem | Answer | % Correct |
|---|---|---|
| 40 - 7 = | 33 | 100%
|
| 40 - 40 = | 0 | 99%
|
| 23 - 8 = | 15 | 99%
|
| 29 - 11 = | 18 | 99%
|
| 33 - 12 = | 21 | 99%
|
| 29 - 4 = | 25 | 99%
|
| 38 - 9 = | 29 | 99%
|
| 33 - 29 = | 4 | 99%
|
| 40 - 35 = | 5 | 99%
|
| 37 - 26 = | 11 | 98%
|