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1-minute subtraction test

Answer as many subtraction facts as you can in 60 seconds. Free, no signup, and it shows the ones you missed.

How it works

1. Pick within 10 or within 20.
2. Press Start. Type each answer and press Enter (or Next).
3. After 60 seconds you get your score, your best score on this device, and the facts you missed.

Need a strategy? See the mental math tricks. Other 1-minute tests: addition · multiplication · division.

Common questions

What are the subtraction facts within 20?

The facts that undo the addition facts: 15 − 7 = 8 undoes 8 + 7 = 15. Thinking of them as a missing number helps: 7 plus what makes 15?

Is this the same as a mad minute?

Yes, it's the same idea: answer as many facts as you can in one minute, then look at the ones you missed.