Multiply Unit Fractions by Whole Numbers (Using Number Lines)
Consider the number line:
Also, consider the multiplication sentence:
3  × ? = 

Let's identify the missing number to describe the number line.
Observe that on the given number line, starting from 0, three jumps of
1
4
are made to reach at
3
4
.
So, the number line represents the multiplication sentence:
3  × 

= 

So, the missing number is 

. 
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.