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Grade-4
Adding Fractions With Unlike Denominators - Word Problems
Practice Preview
Ryan gives
2
10
of a can of dog food to his pet in the morning and
1
9
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 10 and 9 is 90.
Now, we have to make sure both fractions have the same new denominator 90.
You can write fraction
2
10
as
2x9
10x9
=
18
90
You can write fraction
1
9
as
1x10
9x10
=
10
90
Now, both fractions have same denominator and we are ready to add
18
90
+
10
90
=
18+10
90
=
28
90
That can be simplified to
=
14
45
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