Some readers may solve the problem procedurally: line up the two numbers, add the ones column, carry the one, and add the tens to get 43. Others might instead notice a creative shortcut: 29 + 14 is ...
People often solve simple arithmetic problems, such as basic addition, subtraction, multiplication or division, in their minds. The precise mental processes they rely on to solve these problems, ...
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.
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