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Simple to play. Just select the integer addition problem that has the correct answer. The integer problems contain two numbers ranging from -9 to 9. As you answer more problems correctly, there will be more integer problems to choose from. Choose to play in timed or untimed mode.
Click the integer problem containing a correct answer. If playing in timed mode you'll need to select the correct problem before time runs out. To reset the saved high scores go to the instructions page via the "?" button and select "Y" on the Reset High Scores button.
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