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11-5 Subtracting Integers Course 1 Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day

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Warm Up Find each sum. 1. – – –8 + 9 Give the opposite of each number –8 7. – Course Subtracting Integers 1 –7 8 3 –1

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Problem of the Day Jamal knows his average score for 3 science tests. If he adds the average and the amount that each score differs from the average, what will his sum be? Course Subtracting Integers The average

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Learn to subtract integers. Course Subtracting Integers

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Course 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.

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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 – (–5) – (–9) The addition modeled is –5 – (–9) = 4. Course Subtracting Integers

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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 – Course Subtracting Integers

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Additional Example 2A: Subtracting Integers Find the difference. 4 – 6 4 – 6 = –2 (–6) 4 –3 –2 – Course Subtracting Integers

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Additional Example 2B: Subtracting Integers Find the difference. 3 – (–3) –(–3) 3 3 – (–3) = 6 – Course Subtracting Integers

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Check It Out: Example 2A Find the difference. 2 – (–5) – – (–5) 2 2 – (–5) = 7 Course Subtracting Integers

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Check It Out: Example 2B Find the difference. 3 – 6 3 – 6 = –3 (–6) 3 –3 –2 – Course Subtracting Integers

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

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

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Lesson Quiz Find each difference – 52. –9 – (–3) Evaluate x – (–7) for each value of x. 3. x = –24. x = 5 5. The peak of Mt. Everest is approximately 26,544 ft above sea level. The shore of the Dead Sea is about 1,200 ft below sea level. How much higher is the peak of Mt. Everest than the shore of the Dead Sea? –6 3 Insert Lesson Title Here 5 27,744 ft 12 Course Subtracting Integers

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