| Problem | Sum | % Correct |
|---|---|---|
| 1+9= | 10 | 100%
|
| 2+8= | 10 | 100%
|
| 3+7= | 10 | 100%
|
| 4+6= | 10 | 100%
|
| 6+4= | 10 | 100%
|
| 7+3= | 10 | 100%
|
| 2+9= | 11 | 100%
|
| 3+8= | 11 | 100%
|
| 4+7= | 11 | 100%
|
| 6+5= | 11 | 100%
|
| 7+4= | 11 | 100%
|
| 9+2= | 11 | 100%
|
| 3+9= | 12 | 100%
|
| 6+6= | 12 | 100%
|
| 7+5= | 12 | 100%
|
| 8+4= | 12 | 100%
|
| 9+3= | 12 | 100%
|
| 4+9= | 13 | 100%
|
| 5+8= | 13 | 100%
|
| 6+7= | 13 | 100%
|
| 8+5= | 13 | 100%
|
| 6+8= | 14 | 100%
|
| 7+7= | 14 | 100%
|
| 8+6= | 14 | 100%
|
| 6+9= | 15 | 100%
|
| 9+6= | 15 | 100%
|
| 9+9= | 18 | 100%
|
| 1+1= | 2 | 100%
|
| 2+1= | 3 | 100%
|
| 2+2= | 4 | 100%
|
| 1+4= | 5 | 100%
|
| 2+3= | 5 | 100%
|
| 1+5= | 6 | 100%
|
| 2+4= | 6 | 100%
|
| 3+3= | 6 | 100%
|
| 4+2= | 6 | 100%
|
| 5+1= | 6 | 100%
|
| 1+6= | 7 | 100%
|
| 4+3= | 7 | 100%
|
| 6+1= | 7 | 100%
|
| 1+7= | 8 | 100%
|
| 3+5= | 8 | 100%
|
| 4+4= | 8 | 100%
|
| 2+7= | 9 | 100%
|
| 3+6= | 9 | 100%
|
| 4+5= | 9 | 100%
|
| 5+4= | 9 | 100%
|
| 6+3= | 9 | 100%
|
| 8+7= | 15 | 88%
|
| 5+3= | 8 | 88%
|
| 7+2= | 9 | 86%
|
| 7+8= | 15 | 83%
|
| 5+2= | 7 | 83%
|
| 5+6= | 11 | 80%
|
| 4+8= | 12 | 80%
|
| 9+7= | 16 | 80%
|
| 1+3= | 4 | 80%
|
| 3+2= | 5 | 80%
|
| 2+5= | 7 | 80%
|
| 7+1= | 8 | 80%
|
| 1+8= | 9 | 80%
|
| 8+1= | 9 | 80%
|
| 7+6= | 13 | 75%
|
| 7+9= | 16 | 75%
|
| 1+2= | 3 | 75%
|
| 9+1= | 10 | 67%
|
| 9+4= | 13 | 67%
|
| 5+9= | 14 | 67%
|
| 9+5= | 14 | 67%
|
| 8+9= | 17 | 67%
|
| 4+1= | 5 | 67%
|
| 8+2= | 10 | 60%
|
| 8+3= | 11 | 50%
|
| 3+1= | 4 | 50%
|
| 3+4= | 7 | 50%
|
| 2+6= | 8 | 50%
|
| 6+2= | 8 | 50%
|
| 8+8= | 16 | 33%
|
| 5+5= | 10 | 0%
|
| 5+7= | 12 | 0%
|
| 9+8= | 17 | 0%
|