Decompose Fractions into Unit Fractions
A unit fraction is a fraction in which numerator is 1.
Let's decompose 

as a sum of unit fractions  . 
Make a model to identify the sum of the unit fractions.
This model represents a whole divided into 7 equal parts.
Here, each part represents the unit fraction, 

. 
Now, select 3 parts to represent the fraction 

. 
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.