1. Learn to subtract integers. Course 1 11-5 Subtracting Integers

2. Course 1 11-5 Subtracting Integers Subtracting Integers on a Number Line Move left on a number line to subtract a positive integer. Move right on a number line to subtract a negative integer.

3. Additional Example 1: Writing Integer Subtraction Write the subtraction modeled on each number line. A. B. –8 –7 – 6 –5 –4 –3 –2 –1 0 1 –3 –4 The subtraction modeled is –3 – 4 = –7. –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 (–5) – (–9) The addition modeled is –5 – (–9) = 4. Course 1 11-5 Subtracting Integers

4. Check It Out: Example 1 Write the subtraction modeled on each number line. A. B. –5 –2 The subtraction modeled is –5 – 2 = –7. (–3) –(–5) The addition modeled is –3 – (–5) = 2. –8 –7 – 6 –5 –4 –3 –2 –1 0 1 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 Course 1 11-5 Subtracting Integers

5. Additional Example 2A: Subtracting Integers Find the difference. 4 – 6 4 – 6 = –2 (–6) 4 –3 –2 –1 0 1 2 3 4 5 Course 1 11-5 Subtracting Integers

6. Additional Example 2B: Subtracting Integers Find the difference. 3 – (–3) –(–3) 3 3 – (–3) = 6 –1 0 1 2 3 4 5 6 7 Course 1 11-5 Subtracting Integers

7. Check It Out: Example 2A Find the difference. 2 – (–5) –1 0 1 2 3 4 5 6 7 – (–5) 2 2 – (–5) = 7 Course 1 11-5 Subtracting Integers

8. Check It Out: Example 2B Find the difference. 3 – 6 3 – 6 = –3 (–6) 3 –3 –2 –1 0 1 2 3 4 5 Course 1 11-5 Subtracting Integers

9. Additional Example 3: Evaluating Integer Expressions Evaluate a – 4 for a = 2. a – 4Write the expression. 2 – 4Substitute 2 for a. –2Subtract. Course 1 11-5 Subtracting Integers

10. Check It Out: Example 3 Evaluate b – 6 for b= 8. b – 6Write the expression. 8 – 6Substitute 8 for b. 2Subtract. Course 1 11-5 Subtracting Integers