Denominators are just numbers. Factoring them into primes meanss finding their prime factorizations. A factor tree can help you visualize this.
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You will get an equivalent fraction.
It means that the previous fraction was not in its lowest terms.
They are a common factor and any common factor in the numerator and denominator of a ratio can be cancelled out.
93 = 3 x 31
cross product method is multiplying the numerator of the first factor to the denominator of the second factor and multiplying the denominator to the numerator of the second factor.