They are not alike, they are different, but they can be identical in value. Example :- 3/4 and 0.75 are different ways of expressing the same quantity and they are not alike at all.
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Unit fractions all have the same numerators but the denominators can be different.
decimals fractions and percents are all alike because they show parts of 100, per 100(percent, cent representing for 100, century)
Common denominators are multiples that are being used as denominators. The process to find them is the same.
Both result from the comparison of integers. The process used to find them is the same. The only difference is in their function. One is a denominator, one isn't.
Common denominators are created by finding the common multiples of unlike denominators.