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Mental math drill

Practice holding briefly flashed numbers in your head and adding them up.

Press start and the numbers appear after a countdown

About this tool

Numbers flash up and vanish. Instead of holding them with your eyes, you add and multiply them in your head — the method known as flash mental arithmetic, trained by pushing speed and digit count upward.

How to use it

  1. 1 Set the digit count, how many numbers, and the speed.
  2. 2 The numbers flash by in turn; add them in your head.
  3. 3 Type your answer to check it, and raise the speed as it gets easy.

Good to know

  • Scores stay on this device and do not follow you to another
  • A practice tool, not a graded test or certification

Frequently asked questions

It is too fast — I cannot follow at all.

Slow it down and drop to single digits. This kind of training only builds at a speed you can actually follow; above that, nothing sticks.

Does it do multiplication?

You can choose addition or multiplication. For multiplication it helps to start with fewer digits.

Is it suitable for a child?

Yes. There is no account and no advertising, and the record stays on this device. Start at one digit and a slow speed.

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