Adding Doubles
Consider the objects:

Let's find the double of the objects shown.
Notice that there are five objects.
 
To find the double of this number, add five twice.
 
5 + 5 = 10
 

So, the double of the number of given objects is 10.
ds
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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.
 
               
                 
                     
                    