Double Digit Addition

Double digit addition refers to the process of adding two numbers that each have two digits, resulting in a sum that can be either two or three digits.

To add two double digit numbers, align the numbers by their place values (tens and units), add the units first, carry over if necessary, and then add the tens.

The sum of 38 and 42 is 80.

The sum of 59 and 25 is 84.

The sum of 65 and 27 is 92.

The sum of 53 and 29 is 82.

The sum of 78 and 17 is 95.

Carrying in addition is the process of moving a value from one column to the next when the sum of that column exceeds 9.

Place value is important in addition because it helps to correctly align numbers and ensures that each digit is added in the correct column.

A common mistake in double digit addition is misaligning the numbers or forgetting to carry over when the sum exceeds 9.