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Grade-5
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
5
8
-
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 8 and 9 is 72.
Now, we have to make sure both fractions have the same new denominator 72.
You can write fraction
5
8
as
5x9
8x9
=
45
72
You can write fraction
1
9
as
1x8
9x8
=
8
72
Now, both fractions have same denominator and we are ready to subtract
45
72
-
8
72
=
45-8
72
=
37
72
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