| Problem | Answer | % Correct |
|---|---|---|
| 21 x 2 | 42 | 97%
|
| 21 x 1 | 21 | 96%
|
| 21 x 5 | 105 | 95%
|
| 21 x 3 | 63 | 95%
|
| 21 x 4 | 84 | 93%
|
| 21 x 6 | 126 | 92%
|
| 21 x 7 | 147 | 92%
|
| 21 x 9 | 189 | 92%
|
| 21 x 10 | 210 | 92%
|
| 21 x 8 | 168 | 91%
|
| 21 x 11 | 231 | 91%
|
| 21 x 13 | 273 | 91%
|
| 21 x 12 | 252 | 90%
|
| 21 x 14 | 294 | 89%
|
| 21 x 15 | 315 | 89%
|
| 21 x 16 | 336 | 89%
|
| 21 x 21 | 441 | 89%
|
| 21 x 17 | 357 | 88%
|
| 21 x 18 | 378 | 88%
|
| 21 x 20 | 420 | 88%
|
| 21 x 19 | 399 | 87%
|