it is when your only leat common multiple is 1.
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A fraction is in its simplest form when the HCF of its numerator and denominator is 1
When the numerator and denominator have a GCF of 1.
The GCF of 31 and 33 is 1. If the GCF of a numerator and denominator is 1, the fraction is in its simplest form.
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To tell you the truth, ' 0.9 ' doesn't look too terribly complicated just the way it is.If you want to write it as a fraction, then the simplest form is 9/10 .