➖ Subtraction Exercise (Mental)
Mental subtraction exercise: you subtract random numbers in succession from the starting number you choose (999, 9,999 or 99,999).
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Frequently Asked Questions
What does going negative mean?
If closed, numbers are selected so that the result never goes below zero; if open, the chain can descend into negative numbers — ideal for practicing with negative numbers.
Which level should I start with?
999 start + 10-29 range + unlimited mode is ideal for warming up; as you master it, increase to 99,999 + 10-999 + 15 sec time.
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Detailed information about Subtraction Exercise (Mental)
Mental subtraction exercise: you subtract random numbers in succession from the starting number you choose (999, 9,999 or 99,999). You can choose the subtraction range (10-29, 10-99, 10-499, 10-999), whether to allow negative numbers, and the time per question. If the time runs out, the correct answer is shown and you continue.

