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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Jack bought
5
6
gallons of milk. He used
3
9
gallons of milk for making milkshakes. How many gallons of milk is still left with Jack?
(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 9 is 18.
Now, we have to make sure both fractions have the same new denominator 18.
You can write fraction
5
6
as
5x3
6x3
=
15
18
You can write fraction
3
9
as
3x2
9x2
=
6
18
Now, both fractions have same denominator and we are ready to subtract
15
18
-
6
18
=
15-6
18
=
9
18
That can be simplified to
=
1
2
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