Select a level from 0 to 9; this determines the number to add or subtract from each integer. Will increase as after each level.
Choose either "Addition" or "Subtraction" for the arithmetic operation. Will switch each round.
Set a time limit (in seconds) for each input. Will decrease as you complete more questions.
Previous Scores
No scores available.
8
4
1
2
9
0
7
7
9
7