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C3 ch01 04

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C3 ch01 04

  1. 1. 1-4 Adding Integers Learn to add integers.Course 3
  2. 2. 1-4 Adding Integers Additional Example 1A: Using a Number Line to Add Integers Use a number line to find the sum. (–6) + 2 –6 2 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 You finish at –4, so (–6) + 2 = –4. Helpful Hint To add a positive number move to the right. To add a negative number move to the left.Course 3
  3. 3. 1-4 Adding Integers Additional Example 1B: Using a Number Line to Add Integers Use a number line to find the sum. –3 + (–6) –6 -3 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 You finish at –9, so –3 + (–6) = –9.Course 3
  4. 4. 1-4 Adding Integers Check It Out: Example 1A Use a number line to find the sum. (–3) + 7 –3 7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 You finish at 4, so (–3) + 7 = 4.Course 3
  5. 5. 1-4 Adding Integers Check It Out: Example 1B Use a number line to find the sum. (–2) + 4 –2 4 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 You finish at 2, so (–2) + 4 = 2.Course 3
  6. 6. Rules for Adding Integers• If the signs are the same, add and keep the same sign -3 + (-14) = -17• If the signs are different, subtract the two numbers and keep the sign of the larger number -24 + 10 = -14
  7. 7. Rules for Adding Integers• If the signs are the same, add and keep the same sign -3 + (-14) = -17• If the signs are different, subtract the two numbers and keep the sign of the larger number -24 + 10 = -14

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