Add Yahoo as a preferred source to see more of our stories on Google. What is 29 + 14? Some readers may solve the problem procedurally: line up the two numbers, add the ones column, carry the one, and ...

Anand Mahindra's tweet has a short video clip, wherein a school teacher describes a clever shortcut to multiply various numbers by nine -- to be more precise, a hack to remember the table of nine.

“Laziness is our saving grace,” writes mathematician Du Sautoy (The Creativity Code) in this accessible look at thousands of years of mathematical shortcuts. Focusing on 10 different shortcuts, Du ...