11 5 Subtracting Integers Warm Up Problem of

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

11 -5 Subtracting Integers Warm Up Find each sum. 1. – 4 + 6 3. – 3 + 3 2 0 2. 5 + 12 17 4. – 8 + 9 1 Give the opposite of each number. 5. 7 – 7 6. – 8 8 7. – 3 3 8. 1 – 1 Course 1

11 -5 Subtracting Integers Notes Steps 1. To subtract integers, you need to add the additive inverse. 2. This means, keep the first number in the problem the same, change the subtraction to addition, and change the last number to its opposite sign. 3. Then follow addition rules. Course 1

11 -5 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. Course 1

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

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

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

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

11 -5 Subtracting Integers Additional Example 3: Evaluating Integer Expressions Evaluate a – 4 for a = 2. a– 4 Write the expression. 2– 4 Substitute 2 for a. 2 + (-4) – 2 Course 1 Add the additive inverse. Answer

11 -5 Subtracting Integers Check It Out: Example 3 Evaluate b – 6 for b= 8. b– 6 Write the expression. 8– 6 Substitute 8 for b. 8 + (-6) Add the additive inverse. 2 Course 1 Answer

11 -5 Subtracting Insert Lesson Integers Title Here Lesson Quiz Find each difference. 1. 8 – 5 3 2. – 9 – (– 3) – 6 Evaluate x – (– 7) for each value of x. 3. x = – 2 5 4. x = 5 12 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? 27, 744 ft Course 1