Regrouping in math addition is a process used when the sum of digits in a column exceeds nine. It’s a way of handling situations where carrying over is necessary to maintain the integrity of the mathematical operation.
For example, if you are adding 47 and 35, you would start with the digits in the ones place: 7 + 5 equals 12. Since 12 is more than 10, you would write down the 2 in the ones place of the answer and carry over the 1 to the tens place.
Next, you add the digits in the tens place: 4 + 3 equals 7, plus the 1 you carried over makes 8. Thus, the final answer is 82. This technique ensures that the addition is done correctly, and it’s an essential skill for mastering arithmetic.