Preview
Addition and subtraction of fractions with unlike denominators is just the same thing as simple addition and subtraction of fractions so let's take the two fractions 5/7 and 3/8 and let's start by first putting these fractions in vertical form:
5
7
+
3
8
And now we have to find the LCM of the two denominators 7 and 8 and rename the fractions like this:
5
7 7,14,21,28,35,42,49,56
+ =
3 8,16,24,32,40,48,56,64
8
40
56
+
21
56
So now all we have to do is add the numerators and put the denominator as it is in the fraction like this:
40
56 61
+ = 56
21
56
So now we have a improper fraction as our answer so you can either leave as it is or if you want make it an improper fraction.
Now let's take the fractions 6/12 and 2/6 and let's subtract by first putting them in vertical form:
Now let's take the fractions 6/12 and 2/6 and let's subtract by first putting them in vertical form:
6
12

2
6
Next you have to find the LCM of the two denominators 12 and 6 and rename the fractions like this:
6
12 12,24,36,48,60
 =
2 6,12,18,24,30
6
6
12

4
12
Now you have to simply subtract the numerators and bring the denominator as it is like this:
12
24 4 1
 = 24 = 6
8
24
So our final answer is 4/24 or the simplified term 1/6.
Now try some of these and make sure to watch the video on YouTube.
Now try some of these and make sure to watch the video on YouTube.
Sheet 1 Adding and Subtracting Fractions with Unlike Denominators
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