Math Trainer

A minute to solve as many problems as you can.
Comes with four modes:

-Arithmetic: Solve the sums, subtractions, multiplications or divisions, also have mixed operations

-Equation: The same as arithmetic, but this time the unknown could be anywhere

-Multiplications: Solve multiplications from 1 to 9

-Big multiplications: Solve bigger multiplications

I'll add more modes and any of your suggestions will be welcomed. Also, if you find any bug, please make me know.
This app is ad free.