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Grade-4
Adding Fractions With Unlike Denominators - Word Problems
Practice Preview
Joshua gives
2
7
of a can of dog food to his pet in the morning and
3
5
of a can of dog food in the evening. How many cans of dog food did he give to his dog?
(Solve and reduce the fraction.)
Explanation
Remember, we cannot add fractions until the denominators are same. So, we have to find the least common denominator.
Least Common Denominator (LCD) of 7 and 5 is 35.
Now, we have to make sure both fractions have the same new denominator 35.
You can write fraction
2
7
as
2x5
7x5
=
10
35
You can write fraction
3
5
as
3x7
5x7
=
21
35
Now, both fractions have same denominator and we are ready to add
10
35
+
21
35
=
10+21
35
=
31
35
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