UPSKILL MATH PLUS

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Fill in the following surprise number as per the instruction :
 
Pick the number from the dropdown:
 
Double the picked number:  \(×\)  \(=\)
 
Again double it:  \(×\) \(2 =\)
 
Add the number you picked first to the answer:  \(+\)  \(=\)
 
Now again double it:  \(×\) \(2 =\)
 
Divide by \(10\):  ÷ \(10 =\) .
 
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Hurray!!!
 
Both the start and end numbers are the same.... 
 
How it works? Let's see the explanation.