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In two-digit addition, two digit numbers are added together to get a sum. In order to make sure the sum is represented by a single digit, the number is regrouped if necessary. This means that if the two digits of the sum are greater than 9, the number is regrouped by taking the tens digit and adding it to the ones digit. For example, in the sum 23 + 6, the two digits are 2 and 3. The sum is 23 + 6 = 29. The number 29 is regrouped as 2 + 9 = 11.