Converting a decimal to a vulgar fraction and back
To convert a decimal to a vulgar fraction it is necessary: a number after a decimal point to make as the
numerator, and the n-th power of 10 ( here n – a quantity of decimal places ) - as the denominator. A non-zero integer part of a decimal
is saved the same in a vulgar fraction; a zero integer part is omitted. For example:
To convert a vulgar fraction to a decimal it is necessary to divide a numerator by a denominator according to the division rules.
E x a m p l e . Convert 5 / 8 to a decimal fraction.
S o l u t i o n . Dividing 5 by 8, we’ll receive 0.625. ( Check it, please ! )
In the most of cases this process can be continued infinitely. Then a simple fraction cannot be converted exactly
to a decimal. But in practice this is never required. Dividing is broken if decimal places, that are of interest, have been already received.
E x a m p l e . Convert 1 / 3 to a decimal fraction.
S o l u t i o n . Dividing 1 by 3 will be infinite: 1:3 = 0.3333… . Check it, please.