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Basic Addition and Subtraction

MASTER Adding and Subtracting 1-digit, 2-digit and 3-digit numbers MENTALLY, as well as making change. Learn about complements and how to make a hard addition problem an easy subtraction problem.

There are three levels of difficulty: beginner, intermediate and advanced.

Select “Set Up” to choose the desired topic and level.

Problems will be randomly generated until you correctly answer 20 problems. Your time and number of misses are recorded.

Keep trying until you can do a set perfectly (no misses) in under 60 seconds. That’s mastery!
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