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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Thomas used
1
6
of
3
7
liters of glue for an art project. How much of the glue is left now?
(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 6 is 42.
Now, we have to make sure both fractions have the same new denominator 42.
You can write fraction
3
7
as
3x6
7x6
=
18
42
You can write fraction
1
6
as
1x7
6x7
=
7
42
Now, both fractions have same denominator and we are ready to subtract
18
42
-
7
42
=
18-7
42
=
11
42
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