Find the greatest common factor (GCF) of the numerator and the denominator of the ratio. If the GCF is 1 you are done. If not divide both, the numerator and the denominator, by the GCF and then you are done.
For example:
3/7: the GCF is 1 so the ratio cannot be simplified.
3/6: the GCF is 3 so the ratio is 1/2
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Find the GCF of the two numbers and divide them both by it. If the GCF is 1, the ratio is in its simplest form.
18/7 is in its simplest form.
14:45 written as a fraction in simplest form is 1/3
46/54 = 23/27; as there is now a prime number in the fraction, that is its simplest form.
2.8 / 4 = 0.7 / 1
The correct answer would be 3/4