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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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For Halloween, Abigail received
2
10
pounds of candy. After a week, her family had eaten
1
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 10 and 8 is 40.
Now, we have to make sure both fractions have the same new denominator 40.
You can write fraction
2
10
as
2x4
10x4
=
8
40
You can write fraction
1
8
as
1x5
8x5
=
5
40
Now, both fractions have same denominator and we are ready to subtract
8
40
-
5
40
=
8-5
40
=
3
40
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