I assume you mean, with different denominators. If you want to add the fractions, subtract them, or compare them (determine which one is greater), you have to convert them to similar fractions (fractions with the same denominator) first. Converting to similar fractions is not necessary, and usually doesn't even help, if you want to multiply or divide fractions.
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Dissimilar fractions are fractions whose denominators are different. Any rules will depend on what you wish to do with them.
fractions having same denominators are like fractions & others are unlike fractions
6/7 - 2/7 = 4/7
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Yes they can. For example: if I have the fraction 3/6, this equals out to 1/2 or 0.5. Another fraction, for example 4/8, when you divide the numerator and the denominator by 4, you also get 1/2 or 0.5. Another way to do this is to get out a calculator, and punch in 3/6. You should get 0.5 as your answer. Then punch in 4/8, and you should still get the answer 0.5 proving that two different fractions can have the same equivalent.
Finding the LCM will make adding and subtracting fractions easier.