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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Thomas bought
5
6
gallons of milk. He used
2
7
gallons of milk for making milkshakes. How many gallons of milk is still left with Thomas?
(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 7 is 42.
Now, we have to make sure both fractions have the same new denominator 42.
You can write fraction
5
6
as
5x7
6x7
=
35
42
You can write fraction
2
7
as
2x6
7x6
=
12
42
Now, both fractions have same denominator and we are ready to subtract
35
42
-
12
42
=
35-12
42
=
23
42
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