WHOLE NUMBER ADDITION

Concept: Use addition to combine quantities, or find a total (or sum). The answer to an addition equation is called the sum. Follow these steps to add whole numbers.

Steps for Addition of Whole numbers

Step 1 | Arrange the numbers being added so the digits are aligned in columns from right to left.
Step 2 | Start with the column furthest to the right (called the “ones” column). Add the numbers in that column first, placing the result underneath the Results Line. When a column of digits has a sum greater than 9, carry the left number to the next column on the left.
Step 3 | Working from right to left, add the numbers in each column.

Example 1 Add 44 and 24

Step 1 | Arrange the numbers being added so the digits are aligned in columns. | 4 4 +2 4
Step 2 | Add the numbers in the column furthest to the right, the ones column. (4 + 4 = 8). Write 8 at the bottom of the ones column, underneath the Results Line. | 4 4 +2 4 8
Step 3 | Working from right to left, add the numbers in each column. 4 + 2 = 6 | 4 4 +2 4 68
Step 3 | The sum of 4 4 and 2 4 is 68. | 4 4 +2 4 68

Example 2 Add 169 and 683

Step 1 | Arrange the numbers being added so the digits are aligned in columns. | 1 6 9 +6 8 3
Step 2 | Add the numbers in the column furthest to the right, the ones column. (9 + 3 = 1 2). Note that the sum of the digits in the ones column, 1 2, is greater than 9. When a column of digits has a sum greater than 9, carry the left number to the next column on the left. Therefore, write 2 at the bottom of the ones column, underneath the Results line, and carry 1 to the top of the next column on the left, called the “tens” column. | 1 1 6 9 +6 8 3 2
Step 3 | Working from right to left, add the numbers in each column. 1 + 6 + 8 = 1 5 (When a column of digits has a sum greater than 9, carry the left number to the next column on the left.) | 1 1 1 6 9 +6 8 3 52
Step 3 | Continue adding the remaining columns, carrying when necessary. 1 + 1 + 6 = 8 | 1 1 1 6 9 +6 8 3 852
Step 3 | The sum of 1 6 9 and 6 8 3 is 852 | 1 1 1 6 9 +6 8 3 852