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Fractions Addition: Simple Fractions, Common Denominator

On this page and the next page, we will add fractions that already have a common denominator.

To add two fractions, we:
1) Make sure that each fraction has the same denominator: the least common denominator.
2) Add only the numerator of each fraction.
3) After adding, write the answer over the denominator.

Our first example is 1 / 5 + 3 / 5:

1) Each fraction has the same denominator: 5.

2) 1 + 3 = 4.

3) 4 over 5 is 4/5.

1 / 5
+
3 / 5
=
4 / 5
+
=
   White Box   White Box   White Box   White Box  plus     White Box   White Box   White Box   White Box  equals     White Box   White Box   White Box   White Box

The next example is 2 / 9 + 5 / 9:

1) Each fraction has the same denominator: 9.

2) 2 + 5 = 7.

3) 7 over 9 is 7 / 9.

2 / 9
+
5 / 9
=
7 / 9
+
=
   White Box   White Box   White Box   White Box   White Box   White Box   White Box   White Box  plus     White Box   White Box   White Box   White Box   White Box   White Box   White Box   White Box  equals 

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