Mental Math

Mental Math is a brain game to test/enhance your mental calculations skill.
Doing calculations in mind also perfects your focus, working memory and processing speed.
How To Start
Mental Math exercise consists of two fields: the expression field and the result field below it:

To start the game press the Enter keyboard key.
When you have calculated the result enter it into the result field and press enter. You will see if your result was correct or the correct one if it wasn't.