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Grade-4
Subtracting Fractions With Unlike Denominators - Word Problems
Practice Preview
Navya and her cousins ate
2
7
of a family pizza. If Navya ate
1
8
of the pizza, how much did the rest of her cousins eat?
(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 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
1
8
as
1x7
8x7
=
7
56
Now, both fractions have same denominator and we are ready to subtract
16
56
-
7
56
=
16-7
56
=
9
56
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