First compare the hundreds digit. If the hundreds digits are same, then compare the tens digit. If tens digits are same then compare the ones digits.
For example: Let's compare 324 and 380.
Notice that both the numbers have three digits.
324 ____ 380
We start comparing from the hundreds digits.
Observe that, in both the numbers hundreds digit is three.
Now, compare the tens digits.
The tens digit in 324 is 2 and in 380 is 8.
Now, 2 is less than 8.
So, 324 is less than 380.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.