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Grade-4
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
4
6
-
4
7
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 7 is 42.
Now, we have to make sure both fractions have the same new denominator 42.
You can write fraction
4
6
as
4x7
6x7
=
28
42
You can write fraction
4
7
as
4x6
7x6
=
24
42
Now, both fractions have same denominator and we are ready to subtract
28
42
-
24
42
=
28-24
42
=
4
42
That can be simplified to
=
2
21
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