Addition with Regrouping

Step 1: Place 18 and 5 in proper columns according to their place values one below the other as shown above.

Step 2: Add 8 and 5 which comes to 13. Since 13 has exceeded 9 we will regroup it. In other words, 13 is a two-digit number so we will regroup this sum into tens and ones. This means we will carry over the tens digit of the sum to the preceding column and write the ones digit in that particular column. Here, we will write 3 in ones column, and carry over 1 to the tens column.

Step 3: This 1 which is a carryover in the tens column will be added to the existing number which is 1. So the sum of this column will be 2. Therefore, the sum of 18 + 5 = 23.