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Grade-5
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
3
6
-
2
9
Explanation
Remember, we cannot subtract fractions until the denominators are same. So, we have to find the least common denominator.
Least Common Denominator (LCD) of 6 and 9 is 18.
Now, we have to make sure both fractions have the same new denominator 18.
You can write fraction
3
6
as
3x3
6x3
=
9
18
You can write fraction
2
9
as
2x2
9x2
=
4
18
Now, both fractions have same denominator and we are ready to subtract
9
18
-
4
18
=
9-4
18
=
5
18
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