Breaking apart addends as a way to solve an addition problem means to reorganize the numbers in a way that makes the numbers easier to calculate. This multistep technique often involves rearranging the addends -- the numbers being added together -- into groups of tens and ones, and then adding the tens and ones individually before adding them together to produce the final sum.

Restructuring for Tens and Ones

Step 1

Write the addition problem 27 + 13 = ___ on the paper.

Step 2

Break 27 into 20 + 7, and 13 into 10 + 3.

Step 3

Add 20 + 10 to get 30. Then, add 7 + 3 to get 10.

Step 4

Add 30 + 10 to obtain the total sum of 40: 27 + 13 = 40.