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Grade-4
Adding Fractions With Unlike Denominators
Practice Preview
Add and write the simplified fraction :
2
8
+
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 8 and 9 is 72.
Now, we have to make sure both fractions have the same new denominator 72.
You can write fraction
2
8
as
2x9
8x9
=
18
72
You can write fraction
1
9
as
1x8
9x8
=
8
72
Now, both fractions have same denominator and we are ready to add
18
72
+
8
72
=
18+8
72
=
26
72
That can be simplified to
=
13
36
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