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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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For Halloween, Cathy received
3
7
pounds of candy. After a week, her family had eaten
2
9
pounds. How many pounds of candy does she have left?
(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 7 and 9 is 63.
Now, we have to make sure both fractions have the same new denominator 63.
You can write fraction
3
7
as
3x9
7x9
=
27
63
You can write fraction
2
9
as
2x7
9x7
=
14
63
Now, both fractions have same denominator and we are ready to subtract
27
63
-
14
63
=
27-14
63
=
13
63
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