Adding a 1digit Number to a 2digit Number (with regrouping)
We can find the sum of a onedigit and a twodigit 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.
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.