Fractions on Number Lines
Consider the number line:
Let's identify the fraction represented by the dot on the number line.
To identify the fraction, count the number of segments between 0 and 1.
There are 4 segments.
Now, count the number of segments between 0 and the given dot.
There are 3 segments.
So, the fraction represented on the given number line is 

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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.