To add two numbers, first align the numbers so that place values are lined up and then start adding from the right most place value.
For example: Let's find the sum of 125 and 211.
Now, add the tens.
Add the hundreds.
The sum of 125 and 211 is 336.
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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.