Comparing Decimals with Mixed Numbers
To compare a decimal and a mixed number,
first convert, or change, one of the numbers so that we have either two decimals or two mixed numbers (or two fractions). Then, compare as usual.
For example: Let’s compare 4
1 5
and 4.13.
First, let's write the mixed number as a decimal.
In order to do so, we first write the fractional part of the mixed number,
1 5
, as a decimal.
Write
1 5
as an equivalent fraction with 10 as the denominator.

= 

= 

Now, write
2 10
as a decimal.

=  0.2 
So,  4 

=  4.2  . 
Now, compare 4.2 and 4.13.
As the tenth digit of 4.2 is greater than the tenth digit of 4.13,
4.2 > 4.13
So, 4 

>  4.13  . 
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.