it will ask you either if you want to do + (addition); - (subtraction); * (multiplication); or / (division). Type in ONLY one of them. Then, it will ask you which numbers you want to put into the math problem. you can ONLY put in one set of numbers at a time. You DO NOT have to put in the symbol that you want to do. For example, 91 + (and then DON'T out in a second number. ONLY one set of numbers at a time. For example, 21, then 43.
Absolutely free! (just don't use it to cheat in school or else you might get in trouble tbh) 27 blocks total, Kinda ez to make ngl