Section 1.2 Addition of Whole Numbers and Perimeter 11 Addition of numbers may include more than two addends. Adding Whole Numbers Example 5 Add. Solution: 21,076 84,158 2419 1 1,0 2 1 7 2 6 84,158 2,419 107,653 3. Properties of Addition We present three properties of addition that you may have already discovered. Addition Property of 0 The sum of any number and 0 is that number. Examples: 5 0 5 0 2 2 Commutative Property of Addition Changing the order of two addends does not affect the sum. Example: 5 7 is equivalent to 7 5 In mathematics we use parentheses ( ) as grouping symbols. To add more than two numbers, we can group them and then add. For example: 12 32 8 5 8 13 2 (3 8) Parentheses indicate that is added first. Then the result is added to 2. 2 11 13 3 8 Associative Property of Addition The manner in which addends are grouped does not affect the sum. Example: 11 72 3 is equivalent to 1 17 32 Answer 6. 71,147 In this example, the sum of the digits in the ones column is 23. Therefore, we write the 3 and carry the 2. Parentheses indicate that 2 3 is added first. Then 8 is added to the result. Skill Practice Add. 6. 57,296 4,089 9,762
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