You look for common factors, and divide both numerator and denominator by the same factor. For example, 9/12 has the common factor 3, if you divide numerator and denominator by 3, you get 3/4.
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Find the GCF of the numerator and the denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.
It means to reduce fractions to their lowest terms as for example 4/8 = 1/2 in its lowest terms
It is already in lowest terms.
0.642 as a fraction in its lowest terms is 321/500
67% = 67/100
For a _positive_ fraction to be proper and in lowest terms, the numerator must be less than the denominator and be relatively prime. For denominator 1: 0 possible numerators. For denominator 2: 1 possible numerator. For denominator 3: 2 possible numerators. For denominator 4: 2 possible numerators. For denominator 5: 4 possible numerators. For denominator 6: 2 possible numerators. For denominator 7: 6 possible numerators. For denominator 8: 4 possible numerators. For denominator 9: 6 possible numerators. Adding all of them together gives 27 positive proper fractions in lowest terms. Symmetrically, there are 27 negative proper fractions in lowest terms. Also, 0/1 is in lowest terms by the above definition. So in total, there are 55 proper fractions in lowest terms with denominator being an integer from 1 to 9.