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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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John bought
1
8
gallons of milk. He used
1
10
gallons of milk for making milkshakes. How many gallons of milk is still left with John?
(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 8 and 10 is 40.
Now, we have to make sure both fractions have the same new denominator 40.
You can write fraction
1
8
as
1x5
8x5
=
5
40
You can write fraction
1
10
as
1x4
10x4
=
4
40
Now, both fractions have same denominator and we are ready to subtract
5
40
-
4
40
=
5-4
40
=
1
40
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