# Calculator: mental arithmetic against the clock

> The mental math game Calculator: solve as many problems as you can, from times tables to extreme terms, in three game modes. Free in the browser.

Address: https://marckimmel.de/en/spiele/brain-games/calculator
Deutsche Fassung: https://marckimmel.de/spiele/brain-games/calculator.md

Mental math against the clock: solve as many problems as possible, from the small times tables to extreme terms. In three game modes from Survival to Tick Tack.

Kind: In the browser, single player.

## How to play

- You pick an operation, from the small times tables up to extreme terms, and one of the three game types.
- A problem appears, you type the result and confirm, and the next one follows at once. Survival ends at the first mistake, One minute counts for sixty seconds, and in Tick tack every correct answer adds time while every wrong one costs some.
- What counts is the number of correct answers, weighted by the operation. Afterwards the review shows every problem with your answer and the time you took.

## Related

- [Calculator: Rules](https://marckimmel.de/en/spiele/brain-games/calculator/regeln.md)
- [All games](https://marckimmel.de/en/spiele.md)