18 is an integer, not a fraction. There is not really a sensible way of writing it as a fraction or mixed number. However, if you must, you can use 18/1.
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The fraction 18 over 1000 reduced to its simplest terms is 9/500
The simplest fraction for 18/20 is 9/10.
The simplest form of the fraction 9/18 is 1/2. This can be determined by dividing both the numerator (9) and the denominator (18) by their greatest common factor, which is 9. By simplifying the fraction in this way, we get the equivalent fraction 1/2, which is in its simplest form.
18% As a fraction = 18/100 or 9/50 As a decimal = 0.18
18/42 = 3/7 in its simplest form