You can calculate equivalent rational fractions if you multiply both, the numerator (10) and denominator (12), by any non-zero integer.
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equivalent fractions for 10 over 4 = 5/2, 20/8, 30/12
10 over 12 or 15 over 18.
8 over 10 (8/10) and 12 over 15 (12/15) are equivalent to 4 over 5 (4/5).
5/6, 10/12
10/12, 15/18
8/10 or 12/15
10/6 5/3
6/10 or 3/5
5/6, 10/12
120 over 10. 24 over 2. 36 over 3.
5/6 is equivalent to 10/12 and 15/18