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 Question from Jason: Hi! Is there a method to approximately convert inches to cm in my head without using a calculator? Thanks! Jason

HI Jason,

There are 2.54 centimeters in an inch which is approximately two and a half centimeters in an inch. Four times two and a half is ten and hence there are approximately ten centimeters in 4 inches. That's what I use approximately convert inches to centimeters

$4 \mbox{ inches } \approx 10 \mbox{ centimeters.}$

Penny