In grade school, you were probably constantly drilled on mathematics. Whether it be multiplication tables, simple addition, or complicated division, it was taught over and over again that quick math ...

Add Yahoo as a preferred source to see more of our stories on Google. It seemed that many were quick to figure out the equation, while others definitley struggled. You’re never too old to learn ...

It seemed that many were quick to figure out the equation, while others definitley struggled. You're never too old to learn something new. People are losing their minds over how simple — yet tricky — ...

Get your timer out and see whether you can remember the golden rule from grade school math class.