10 seconds of math. Be fast. Be clever.

Try to beat the time!
You've got 10 seconds to start. Answer questions to get more time, and don't let the clock run out.

Play

Test it yourself over here at http://www.mental-math-trainer.com

Discussion on HackerNews

https://news.ycombinator.com/item?id=8664180

http://www.learn-swiss-german.ch/ http://www.schweizerdeutsch-lernen.ch/ http://www.michael-jakob.com/