- Subtraction Drill
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- 1st: Enter a minuend and a subtrahend of your choice.
- OR
- 1st: Press the "minuend" button then "subtrahend" buttons.
- OR
- a variation of the above.
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- 3rd: Mentally compute the difference.
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- 4th: Press the "difference" button to see the correct answer.
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- 5th: Repeat as desired.
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