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Grade-5
Subtracting Fractions With Unlike Denominators
Practice Preview
Subtract and write the simplified fraction :
4
7
-
3
6
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 6 is 42.
Now, we have to make sure both fractions have the same new denominator 42.
You can write fraction
4
7
as
4x6
7x6
=
24
42
You can write fraction
3
6
as
3x7
6x7
=
21
42
Now, both fractions have same denominator and we are ready to subtract
24
42
-
21
42
=
24-21
42
=
3
42
That can be simplified to
=
1
14
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