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Grade-5
Adding Fractions With Unlike Denominators
Practice Preview
Add and write the simplified fraction :
5
7
+
1
9
Explanation
Remember, we cannot add fractions until the denominators are same. So, we have to find the least common denominator.
Least Common Denominator (LCD) of 7 and 9 is 63.
Now, we have to make sure both fractions have the same new denominator 63.
You can write fraction
5
7
as
5x9
7x9
=
45
63
You can write fraction
1
9
as
1x7
9x7
=
7
63
Now, both fractions have same denominator and we are ready to add
45
63
+
7
63
=
45+7
63
=
52
63
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