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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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Nathan run a successful bakery. Last month he sold
1
8
blueberry pies and
4
9
blackberry pies. How many more blackberry pies than blueberry pies did Nathan 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 8 is 72.
Now, we have to make sure both fractions have the same new denominator 72.
You can write fraction
4
9
as
4x8
9x8
=
32
72
You can write fraction
1
8
as
1x9
8x9
=
9
72
Now, both fractions have same denominator and we are ready to subtract
32
72
-
9
72
=
32-9
72
=
23
72
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