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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
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Hailey had her friends over and she decided to make chili casserole. She made the chili with
2
6
of an ounce of black beans and
2
10
of an ounce of red beans. How many more black than red beans did she use?
(Solve and reduce the fraction.)
Explanation
Remember, we cannot subtract fractions until the denominators are same. So, we have to find the least common denominator.
Least Common Denominator (LCD) of 6 and 10 is 30.
Now, we have to make sure both fractions have the same new denominator 30.
You can write fraction
2
6
as
2x5
6x5
=
10
30
You can write fraction
2
10
as
2x3
10x3
=
6
30
Now, both fractions have same denominator and we are ready to subtract
10
30
-
6
30
=
10-6
30
=
4
30
That can be simplified to
=
2
15
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