Chapter 2 (Real Numbers) Integers - Addition of Integers (Basic Concepts)

Evaluate - 3 + (-2)

Rule: To add two negative numbers, add their absolute values and take the negative sign for the answer

  • E.g. 1: -25 + (-17) = -42
  • E.g. 2: -21 + (-21) = -42
  • E.g. 3: -18 + (-11) = -29

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Evaluate 3 + (-7)


Rule: To add 2 integers of different signs such that the negative integer has a larger absolute value, we find the difference between their absolute value and take the negative sign for the answer.

  • E.g. 1: -17 + 12 = -5
  • E.g. 2: 52 + (-67) = -15
  • E.g. 3: -88 + 85 = -3
  • E.g. 4: 28 + (-82) = -54

Rule: To add 2 integers of different signs such that the positive integer has a larger absolute value, we find the difference between their absolute value and take the positive sign for the answer.

  • E.g. 1: -12 + 17 = 5
  • E.g. 2: -63 + 68 = 5
  • E.g. 3: 86 + (-53) = 33
  • E.g. 4: -38 + 83 = 45

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