Cube root trick

After reading how to get cube roots in your head in a particular set of circumstances I learned the trick while stuck in traffic. But it then says you have to practice a lot so I wrote a tool in C to do that. But then I realised a web version might be a bit more accessible to people so here’s one.

Made the trainer work nicer on mobiles thanks to [Kae][4]’s suggestion. Also made it a bit smarter in how it picked numbers to train on. Math.random() didn’t seem that random on my machine so I made sure it would provide all numbers from 10 to 99 if you did it long enough. It favours non-divisible by 10 numbers more and it will favour numbers you guess wrong more.