# Adding a 1-digit Number to a 2-digit Number (with regrouping)

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We can find the sum of a one-digit and a two-digit number by regrouping.

For example: Let's find the sum of 11 and 9.

To find the sum of the numbers:

First, add the ones and remember to regroup.

 1 1 1 + 9
 0

Now, add the tens.

 1 1 1 + 9
 2 0

The sum of the given numbers is 20.

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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.