| Prompt | (In)valid Two-Digit Number | % Correct |
|---|---|---|
| Evenly Divisible by 10 | 10, 20, 30… | 100%
|
| Perfect Square | 16, 25, 36… | 96%
|
| Sum of digits less than 16 | 10-78, 80… | 35%
|
| Half of 100 | 50 | 35%
|
| > 50 | 51-99 | 27%
|
| < 90 | 10-89 | 24%
|
| Spelled with less than 4 E’s | 10-16, 18-76… | 8%
|
| Factor of 100 | 10, 20, 25, 50 | 4%
|
| Not evenly divisible by 5 | 11-14, 16-24… | 4%
|
| X, where 18 < X < 79 | 19-78 | 4%
|
| Has any even digit | 10, 12, 14… | 1%
|
| Odd | 11, 13, 15… | 1%
|
| Spelled with 5 or more letters | 11-39, 41-49… | 1%
|
| Has any digit over 3 | 14-19, 24-29… | 1%
|
| Greater than 4! | 25-99 | 1%
|