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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Tyler went to his fridge to get some cranberry juice and noticed he had
2
7
of a jug left. He poured
1
10
of the cranberry juice into his glass. How much of the cranberry juice is left?
(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
2
7
as
2x10
7x10
=
20
70
You can write fraction
1
10
as
1x7
10x7
=
7
70
Now, both fractions have same denominator and we are ready to subtract
20
70
-
7
70
=
20-7
70
=
13
70
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