Compare Fractions Using Number Lines
Fractions on the right are larger than fractions on the left on a number line.
For example: Consider two fractions on a number line:
Here, since 

is on the right side of 

, 

is greater than 

. 
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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.