| Problem | Answer | % Correct |
|---|---|---|
| 6 – 3 = | 3 | 100%
|
| 99 – 6 = | 93 | 100%
|
| 100 - 31 = | 69 | 99%
|
| 15 - 7 = | 8 | 99%
|
| 99 - 99 = | 0 | 98%
|
| 29 - 12 = | 17 | 98%
|
| 68 - 46 = | 22 | 98%
|
| 33 - 6 = | 27 | 98%
|
| 89 - 41 = | 48 | 98%
|
| 87 - 32 = | 55 | 98%
|