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Grade-4
Adding Fractions With Unlike Denominators - Word Problems
Practice Preview
Riley played tennis for
2
7
of an hour on Saturday and
2
8
of an hour on Sunday. How many hours did she play tennis during the weekend?
(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 8 is 56.
Now, we have to make sure both fractions have the same new denominator 56.
You can write fraction
2
7
as
2x8
7x8
=
16
56
You can write fraction
2
8
as
2x7
8x7
=
14
56
Now, both fractions have same denominator and we are ready to add
16
56
+
14
56
=
16+14
56
=
30
56
That can be simplified to
=
15
28
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