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unlike denominators: the bottom number of a fraction. to have unlike denominators you must have two fractions with a different number on the bottom of each fraction.
If we are given two fraction, with two same denominators, we can just say which is bigger by comparing the numerators. But, if the denominators are different, say a/b and p/q, then compare, a*q and p*b.
They have the same numerator (1) but different denominators. Since the numerator is 1 in each fraction, it cannot be simplified therefore each unit fraction is in its simplest form. Then, because the denominators of any two of them are different the fractions must be different.
A proper fraction is one fraction in which the numerator is smaller than the denominator. Dissimilar fractions are two or more fractions whose denominators are different (dissimilar).
-- Times the two numerators together to get the numerator of the answer. -- Times the two denominators together to get the denominator of the answer.