# Add and Subtract Like Fractions

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To add (or subtract) like fractions, add (or subtract) the numerators, and put the result over the common denominator.

For example, let's find the sum:

 6 12
+
 4 12

Observe that the denominator is same in both the fractions.

So, add the numerators, and put the obtained result over the common denominator.

 6 12
+
 4 12
=
 6 + 4 12
=
 10 12

Now, simplify:

 10 12
=
 10 ÷ 2 12 ÷ 2
=
 5 6

So,
 6 12
+
 4 12
=
 5 6
.

ds

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### Help

##### Remember :

The smallest number is the one that comes first while counting.

##### Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.