Developing a new math game

Currently I am working on another math puzzle. My intention here is to let the app test user how fast he/she is in basic mathematical operations.

Again it is going to be simple in UI without any fancy animation etc. Will it be too simplistic? I am not sure. But let me complete it and look at the response.

The test your memory app is OK. But looking back now, I should have done some research for the title. This is too generic, and there is already one popular game by similar name.