Adding Fraction With Different Denominator. Definition. Common Denominator – When the fractions in an addition problem do not have the same denominators, rewrite the problem so that each fraction has the same denominator.
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Here are two ways of finding a common denominator when the largest denominator in addition problem doesn’t work.
Go through the multiplication table of the 6’.
6 x 1 = 6, which cannot be divided by 4.
6 x 2 = 12, which can be divided by 3 and 4.
Raise each fraction to 12ths.
Add the new fractions.
Change the answer to a mixed number and reduce.
2/3 = 8/12
+3/4 = 9/12
27/12 = 2 3/12
= 2 1/4Example2