Instruction (1 of 2)
How good are you at doing two tasks at once?

First, you will have to memorise numbers. Immediately after each of the numbers to memorise, you will have to decide whether an equation shown on the screen is correct or not.


Press the left arrow key if the equation is correct.
Press the right arrow key if the equation is wrong.


Try to be as accurate and as fast as possible.
After this decision, the next number to memorise follows.
To get to the next page, please press the right arrow key on your keyboard.