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4 3/40 = 163/40

On many calculators there is a F <> D key which converts fractions to decimals & vice versa. It's on the TI-30Xa, a fairly common scientific calculator.

But assuming you know that .75 is 3/4, .075 is 1/10 x 3/4 = 3/40 and similarly

.0075 = 3/400 and so on.

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14y ago

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