| Problem | Answer | % Correct |
|---|---|---|
| 248 - 120 = | 128 | 99%
|
| 494 - 241 = | 253 | 99%
|
| 422 - 14 = | 408 | 99%
|
| 90 - 43 = | 47 | 99%
|
| 292 - 14 = | 278 | 98%
|
| 400 - 20 = | 380 | 98%
|
| 78 - 17 = | 61 | 98%
|
| 305 - 150 = | 155 | 97%
|
| 319 - 142 = | 177 | 97%
|
| 213 - 124 = | 89 | 96%
|