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 Description  
 Like Fractions:  Fractions that have the same denominator.

Why do we care about common denominators? Because fractions with common denominators are called like fractions and we can add and subtract only like fractions.

For example,
2
+
3
5
 
4
=
8
+
15
20
 
20
=
23
20

or graphically,
+
=


+
=