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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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Zachary has two pet dogs, a Labrador and a Chihuahua. The Labrador is
5
9
of a meter tall while his pal Chihuahua is only
1
6
of a meter tall. How much taller is the Labrador than the Chihuahua?
(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
5
9
as
5x2
9x2
=
10
18
You can write fraction
1
6
as
1x3
6x3
=
3
18
Now, both fractions have same denominator and we are ready to subtract
10
18
-
3
18
=
10-3
18
=
7
18
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