Proper and Improper Fractions
A proper fraction is a fraction where the numerator (the top number) is less than the denominator (the bottom number).
For example: Consider the fraction.
7 
8 
Notice that numerator is less than the denominator.
So, 

is a proper fraction. 
An improper fraction is a fraction where the numerator (the top number) is greater than or equal to the denominator (the bottom number).
For example: Consider the fraction.
5 
4 
Notice that numerator is greater than the denominator.
So, 

is an improper fraction. 
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.