Comparing Fractions
If the denominators of two fractions are same, the fraction with larger numerator is greater.
For example: Let’s compare the fractions
7 9
and
2 9
.
Both the fractions have same denominators.
So, just compare the numerators 7 and 2.
Since 7 > 2,
So, 

> 

. 
If the numerators of two fractions are the same, the fraction with the smaller denominator is greater.
For example: Let’s compare the fractions
4 5
and
4 7
.
Both the fractions have same numerator.
So, just compare the denominators 5 and 7.
Since 5 < 7,
So, 

> 

. 
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.