Section 1.2 Addition of Whole Numbers and Perimeter 9 Addition of Whole Numbers and Perimeter Section 1.2 1. Addition of Whole Numbers Using the Number Line We use addition of whole numbers to represent an increase in quantity. For example, suppose Jonas typed 5 pages of a report before lunch. Later in the afternoon he typed 3 more pages.The total number of pages that he typed is found by adding 5 and 3. 5 pages 3 pages 8 pages The result of an addition problem is called the sum, and the numbers being added are called addends. Thus, 5 3 8 addends sum The number line is a useful tool to visualize the operation of addition. To add 5 and 3 on a number line, begin at 0 and move 5 units to the right. Then move an additional 3 units to the right. The final location indicates the sum. 0 1 2 3 4 5 6 7 8 9 10 The sum is 8. You can use a number line to find the sum of any pair of digits. The sums for all possible pairs of one-digit numbers should be memorized (see Exercise 9). Memorizing these basic addition facts will make it easier for you to add larger numbers. 2. Addition of Whole Numbers To add whole numbers, line up the numbers vertically by place value. Then add the digits in the corresponding place positions. Concepts 1. Addition of Whole Numbers Using the Number Line 2. Addition of Whole Numbers 3. Properties of Addition 4. Translations and Applications Involving Addition 5. Perimeter Answers 1. Addends: 3, 7, and 12; sum: 22 2. 79 Adding Whole Numbers Example 1 Add. Solution: 2 4 2 tens 4 ones 6 1 6 tens 1 one 8 5 8 tens 5 ones 24 61 Concept Connections 1. Identify the addends and the sum. 3 7 12 22 Skill Practice 2. Add. 47 32
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