Get out your timer and number two pencil to see if your arithmetic skills are still sharp.

Get out your timer and number two pencil to see if your arithmetic skills from grade school are still intact.

It seems like a 'simple' maths equation, but the worse thing is that in this brainteaser, there's is no obvious answer. The subject splits opinion in schools and universities, and while some people ...

Solving arithmetic problems, even simple subtractions, involves mental representations whose influence remains to be clarified. Visualizing these representations would enable us to better understand ...