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Grade-4
Adding Fractions With Unlike Denominators
Practice Preview
Add and write the simplified fraction :
1
9
+
1
7
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 9 and 7 is 63.
Now, we have to make sure both fractions have the same new denominator 63.
You can write fraction
1
9
as
1x7
9x7
=
7
63
You can write fraction
1
7
as
1x9
7x9
=
9
63
Now, both fractions have same denominator and we are ready to add
7
63
+
9
63
=
7+9
63
=
16
63
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