Only quizes that have at least one expression to derive 10 will be displayed. You can tap the ? to see an example expression.
You can enter a number with your favorite 2 to 4 digits too. Unlike quizes that appear automatically, you can also enter numbers that can not be solved.
If the quiz seems to be too difficult or too easy to continue, you can select level 1 or level 3 respectively. The default is level 2.
- Level 1 that can be solved only by addition and subtraction. ex. 1382: 1+3+8−2
- Level 2 that requires multiplication and division. ex. 2647: 2×6÷4+7
- Level at which you need to use parentheses. ex. 3164: 6÷3×(1+4)