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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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Jack wanted to surprise his mom with some chocolate milk. He used
5
7
ounces of milk and
1
10
ounces of chocolate syrup. How much more milk did Jack use than chocolate syrup?
(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 10 is 70.
Now, we have to make sure both fractions have the same new denominator 70.
You can write fraction
5
7
as
5x10
7x10
=
50
70
You can write fraction
1
10
as
1x7
10x7
=
7
70
Now, both fractions have same denominator and we are ready to subtract
50
70
-
7
70
=
50-7
70
=
43
70
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