Good idea, but it cant do the math

I really like the idea of a gesture calculator since you never know where the function buttons are from one calculator to another, but I found that this calculator doesnt do math! If you type in a four digit number with 2 decimal places, and subtract another four digit number with 2 decimal places, it returns a THREE decimal number. Hummm, not the math Im use to. But the real problem is that it doesnt do it all the time.

phatlem about Rechner Calculator