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

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Common Core
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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.

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