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Grade-4
Adding Fractions With Unlike Denominators
Practice Preview
Add and write the simplified fraction :
1
7
+
4
5
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 5 is 35.
Now, we have to make sure both fractions have the same new denominator 35.
You can write fraction
1
7
as
1x5
7x5
=
5
35
You can write fraction
4
5
as
4x7
5x7
=
28
35
Now, both fractions have same denominator and we are ready to add
5
35
+
28
35
=
5+28
35
=
33
35
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