Multiplying Unit Fractions by Whole Numbers
To multiply a unit fraction by a whole number, write the whole number as a fraction with 1 as the denominator and then multiply.
For example, let's find the product:
4 × 

Write 4 as a fraction.
4  = 

4 × 

= 

× 

To multiply fractions, multiply the numerators with each other and the denominators with each other.

× 

= 

= 

So, the required product 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.