4 over (or divided by) 18 is a fraction which is equal to 0.2... (where "..." indicates that the "2" is recurring; i.e. there are an infinite number of 2's after the decimal point).
(Note: there is a special symbol to indicate that a digit is recurring but, as far as I am aware, it is not possible to use it on this website.)
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18/20
11/18 − 4/9 = 1/6
2/9 = 4/18
Yes, 72 / 4 is equal to 18.
Expressed in simplest form, by dividing the numerator and denominator by 2, 18/8 is equal to 9/4 or nine over four.