Fraction of a Number
Let's find the number which is 

of 35. 
Divide 35 into 5 equal groups. Find how many are in each group.
35 ÷ 5 = 7
There are 7 in each group.
Now, find how many are in 2 groups.
2 × 7 = 14
There are 14 in 2 groups.
So, 

of 35 is 14. 
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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.