YOU TRY 1 Add using a number line. Look at Example 1c. Does the procedure make sense? c) To add 4 (1), fi rst move 4 spaces to the left to reach 4. Then, move 1 more space to the left to add 1. The sum is 5. 24 1 (21) 5 25 21 24 27262524 232221 0 1 2 3 4 5 6 7 a) 7 (9) b) 3 8 c) 2 (4) Note When a negative number follows an operation symbol such as , , , or , we usually put the number in parentheses. Example: 4 112 5 This negative number is after the , so put it in parentheses. 2 Add Two Negative Numbers We know that when we add two positive numbers, the sum is positive. When we add two negative numbers, the sum is always negative. Procedure Adding Two Negative Numbers Step 1: Find the absolute value of each number. Step 2: Add the absolute values. Step 3: Put a negative sign in front of the sum. Note The sum of two negative numbers is always negative. Add. a) 6 (13) b) 47 (29) c) 351.6 (607.9) d) 5 8 a 1 2 b Solution a) Step 1: Find the absolute value of each number: 06 0 6, 013 0 13 Step 2: Add the absolute values: 6 13 19 Step 3: Put a negative sign in front of the sum: 6 (13) 19 EXAMPLE 2 726 CHAPTER 10 Signed Numbers www.mhhe.com/messersmith
messersmith_power_basic_college_1e_ch4_7_10
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