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Grade-5
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
3
9
-
2
10
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 9 and 10 is 90.
Now, we have to make sure both fractions have the same new denominator 90.
You can write fraction
3
9
as
3x10
9x10
=
30
90
You can write fraction
2
10
as
2x9
10x9
=
18
90
Now, both fractions have same denominator and we are ready to subtract
30
90
-
18
90
=
30-18
90
=
12
90
That can be simplified to
=
2
15
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