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Add and Subtract Like Fractions

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
.





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Help

The correct answer is

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.