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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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For Halloween, Abby received
5
6
pounds of candy. After a week, her family had eaten
4
8
pounds. How many pounds of candy does she have left?
(Solve and reduce the fraction.)
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 8 is 24.
Now, we have to make sure both fractions have the same new denominator 24.
You can write fraction
5
6
as
5x4
6x4
=
20
24
You can write fraction
4
8
as
4x3
8x3
=
12
24
Now, both fractions have same denominator and we are ready to subtract
20
24
-
12
24
=
20-12
24
=
8
24
That can be simplified to
=
1
3
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