| Problem | Answer | % Correct |
|---|---|---|
| 200 - 100 = | 100 | 100%
|
| 14 - 12 = | 2 | 99%
|
| 57 - 24 = | 33 | 99%
|
| 98 - 9 = | 89 | 99%
|
| 37 - 6 = | 31 | 98%
|
| 179 - 129 = | 50 | 98%
|
| 163 - 44 = | 119 | 97%
|
| 101 - 89 = | 12 | 97%
|
| 122 - 67 = | 55 | 97%
|
| 180 - 47 = | 133 | 96%
|