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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Christopher went to his fridge to get some cranberry juice and noticed he had
4
6
of a jug left. He poured
1
8
of the cranberry juice into his glass. How much of the cranberry juice is 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
4
6
as
4x4
6x4
=
16
24
You can write fraction
1
8
as
1x3
8x3
=
3
24
Now, both fractions have same denominator and we are ready to subtract
16
24
-
3
24
=
16-3
24
=
13
24
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