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Grade-4
Adding Fractions With Unlike Denominators - Word Problems
Practice Preview
Joshua ate
3
5
of a pizza and his brother ate
1
6
of the pizza. What fraction of the pizza did the two eat altogether?
(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 5 and 6 is 30.
Now, we have to make sure both fractions have the same new denominator 30.
You can write fraction
3
5
as
3x6
5x6
=
18
30
You can write fraction
1
6
as
1x5
6x5
=
5
30
Now, both fractions have same denominator and we are ready to add
18
30
+
5
30
=
18+5
30
=
23
30
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