Like and unlike fractions only make sense when you have two [or more] fractions. One fraction, such as 5/12, is always like itself.
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equivalent fractions for 9 over 12 = 3/4, 18/24, 27/36,...
No.
Two equivalent fractions are 2 over 12, and 3 over 18. There much more equivalent fractions besides those.
Two or more fractions having different denominators have unlike denominators. To do addition and subtraction operations with fractions, all fractions must be converted to have like denominators before the numerators can be added or subtracted. For example, 1/2 + 5/6 + 3/8 = 12/24 + 20/24 + 9/24 = 41/24 = 1 17/24
Two fractions that are equivalent to 12/15 are 4/5 and 24/30.