| Operation | Number | % Correct |
|---|---|---|
| Subtract 3 | 66 | 100%
|
| Multiply by ½ | 33 | 94%
|
| Divide by 11 | 3 | 92%
|
| Add 10 | 13 | 91%
|
| Square it | 169 | 76%
|
| Subtract 29 | 140 | 72%
|
| Add 4 | 144 | 70%
|
| Divide by 12 | 12 | 68%
|
| Multiply by 7 | 84 | 60%
|
| Halve it | 42 | 54%
|