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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Andrew and his friends drank
5
7
of a jar of fruit punch. If Andrew drank
4
6
of the fruit punch, how much did the rest of his friends drink?
(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 7 and 6 is 42.
Now, we have to make sure both fractions have the same new denominator 42.
You can write fraction
5
7
as
5x6
7x6
=
30
42
You can write fraction
4
6
as
4x7
6x7
=
28
42
Now, both fractions have same denominator and we are ready to subtract
30
42
-
28
42
=
30-28
42
=
2
42
That can be simplified to
=
1
21
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