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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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Anthony run a successful bakery. Last month he sold
4
10
blueberry pies and
4
9
blackberry pies. How many more blackberry pies than blueberry pies did Anthony sell at the bakery?
(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 10 is 90.
Now, we have to make sure both fractions have the same new denominator 90.
You can write fraction
4
9
as
4x10
9x10
=
40
90
You can write fraction
4
10
as
4x9
10x9
=
36
90
Now, both fractions have same denominator and we are ready to subtract
40
90
-
36
90
=
40-36
90
=
4
90
That can be simplified to
=
2
45
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