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Grade-4
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
3
7
-
3
8
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
3
7
as
3x8
7x8
=
24
56
You can write fraction
3
8
as
3x7
8x7
=
21
56
Now, both fractions have same denominator and we are ready to subtract
24
56
-
21
56
=
24-21
56
=
3
56
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