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 ...
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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