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Grade-4
Adding Fractions With Unlike Denominators - Word Problems
Practice Preview
Anita cooked cheese casserole. She ate
3
8
of the casserole and gave
2
5
of the casserole away to her aunt. How much of the cheese casserole is either eaten or given away by Anita?
(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 8 and 5 is 40.
Now, we have to make sure both fractions have the same new denominator 40.
You can write fraction
3
8
as
3x5
8x5
=
15
40
You can write fraction
2
5
as
2x8
5x8
=
16
40
Now, both fractions have same denominator and we are ready to add
15
40
+
16
40
=
15+16
40
=
31
40
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