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Warm Up Graph each number on a number line. 1. – 5 2. 7 3. –4 4. 0

1-4. Adding Integers. –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7. Course 3. Warm Up Graph each number on a number line. 1. – 5 2. 7 3. –4 4. 0. 1-4. Adding Integers. Course 3. Problem of the Day

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Warm Up Graph each number on a number line. 1. – 5 2. 7 3. –4 4. 0

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  1. 1-4 Adding Integers –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 Course 3 Warm Up Graph each number on a number line. 1. –5 2. 7 3. –4 4. 0

  2. 1-4 Adding Integers Course 3 Problem of the Day Start at (0, 0). Walk 3 blocks west and 2 blocks north. Then walk 4 blocks south and 1 block east. What are your coordinates? (–2, –2)

  3. 1-4 Adding Integers Course 3 TB P. 18-21 Learn to add integers.

  4. 1-4 Adding Integers 2 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 Helpful Hint To add a positive number move to the right. To add a negative number move to the left. Course 3 Additional Example 1A: Using a Number Line to Add Integers Use a number line to find the sum. (–6) + 2 –6 You finish at –4, so (–6) + 2 = –4.

  5. 1-4 Adding Integers -3 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 Course 3 Additional Example 1B: Using a Number Line to Add Integers Use a number line to find the sum. –3 + (–6) –6 You finish at –9, so –3 + (–6) = –9.

  6. 2-1 Adding Integers Think: Find the difference of 1 and –2 . Think: Find the difference of –8 and 5 . Course 3 Additional Example 2: Using Absolute Value to Add Integers Add. A. 1 + (–2) 1 + (–2) –1 2 > 1; use the sign of 2. B. (–8) + 5 (–8) + 5 –3 8 > 5; use the sign of 8.

  7. 1-4 Adding Integers Think: Find the sum of –2 and –4 . Course 3 Additional Example 2: Using Absolute Value to Add Integers Add. C. (–2) + (–4) (–2) + (–4) Same sign; use the sign of the integers. –6

  8. 1-4 Adding Integers Think: Find the difference of –8 and 4 . Course 3 Additional Example 3: Evaluating Expressions with Integers Evaluate c + 4 for c = –8. c + 4 (–8) + 4 Replace c with –8. –8 + 4 = –4 8 > 4; use the sign of 8.

  9. 1-4 Adding Integers Course 3 Additional Example 4: Application Meka opened a new bank account. Find her account balance after the first four transactions listed below. Deposits: $200, $20 Withdrawals: $166, $38 Use a positive sign for deposits and a negative sign for withdrawals. 200 + 20 + (–166) + (–38) Group integers with same signs. (200 + 20) + (–166 + –38) Add integers within each group. 220 + (–204) 220 > 204; use the sign of 220. 16 Meka’s account balance after the first four transactions is $16.

  10. 1-4 Adding Integers Course 3 Insert Lesson Title Here Lesson Quiz: Part I Add. 1. –7 + (– 7) 2. 15 + (–9) + (–2) –14 4 Evaluate each expression for the given value of the variable. 3. 13 + r for r = –15 4. 2 + b + (–9) for b = –6 –2 –13

  11. 1-4 Adding Integers Course 3 Insert Lesson Title Here Lesson Quiz: Part II 5. On Monday, a local dog shelter had six dogs. By Friday they had found homes for three, but took in two more. Then how many dogs were in the shelter? 5 dogs

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