Rules For Integer Operations

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Rules For Integer Operations

  1. 1. Rules for Integer Operations Bryan McDonald Pangburn School District www.macsclass.edublogs.org [email_address]
  2. 2. Adding (when signs are the same) <ul><li>Keep the sign </li></ul><ul><li>Add </li></ul><ul><li>Examples: </li></ul><ul><li>3 + 4 = 7 </li></ul><ul><li>(-9) + (-4) = -13 </li></ul>
  3. 3. Adding (when signs are different) <ul><li>Keep the sign of the number that is farthest from 0 </li></ul><ul><li>Subtract bigger number from smaller number </li></ul><ul><li>Examples: </li></ul><ul><li>-3 + 5 = 2 </li></ul><ul><li>-7 + 4 = -3 </li></ul>
  4. 4. Subtract <ul><li>Change the subtraction sign to an addition sign </li></ul><ul><li>Change the sign of the second number </li></ul><ul><li>Follow addition rules </li></ul><ul><li>Examples: </li></ul><ul><li>3 – (- 7) = </li></ul><ul><li>3 + (+7) = 10 </li></ul>
  5. 5. Multiply/Divide <ul><li>If there are an EVEN number of negative signs …the answer will be POSITIVE </li></ul><ul><li>If there are an ODD number of negative signs …the answer will be NEGATIVE </li></ul><ul><li>Examples: </li></ul><ul><li>-4 x (-7) = 28 </li></ul><ul><li>5 x (-3) = -15 </li></ul>

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