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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
I gave
4
9
of my brownies to Tanya and
2
6
to Elizabeth. How much greater of a fraction of the brownies did I give to Tanya than Elizabeth?
(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
2
6
as
2x3
6x3
=
6
18
Now, both fractions have same denominator and we are ready to subtract
8
18
-
6
18
=
8-6
18
=
2
18
That can be simplified to
=
1
9
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