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Grade-5
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
1
6
-
1
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
1
6
as
1x3
6x3
=
3
18
You can write fraction
1
9
as
1x2
9x2
=
2
18
Now, both fractions have same denominator and we are ready to subtract
3
18
-
2
18
=
3-2
18
=
1
18
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