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The simple answer is that 31 and 33 are coprime - that is, they have no factor in common.
it is when your only leat common multiple is 1.
A fraction is in its simplest form when the HCF of its numerator and denominator is 1
30/33 is not simplest form. It is 10/11.
You can tell that 4/5 is in its simplest form because 5 is a prime number. The 5 is not evenly distributed unless it is by itself or the number 1.
When the numerator and denominator have a GCF of 1.