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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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Bryan drew a line that was
4
9
feet long. If he drew a second line that was
1
6
feet long, what is the difference between the lengths of the two lines?
(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 9 and 6 is 18.
Now, we have to make sure both fractions have the same new denominator 18.
You can write fraction
4
9
as
4x2
9x2
=
8
18
You can write fraction
1
6
as
1x3
6x3
=
3
18
Now, both fractions have same denominator and we are ready to subtract
8
18
-
3
18
=
8-3
18
=
5
18
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