Multiplying and-dividing-integers

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Multiplying and-dividing-integers

  1. 1. MULTIPLYING AND DIVIDING INTEGERS
  2. 2. RULES <ul><li>When multiplying and dividing integers there are two rules: </li></ul><ul><ul><li>When multiplying or dividing integers that have the SAME sign, the answer is POSITIVE . </li></ul></ul><ul><ul><ul><li>Positive x positive = positive </li></ul></ul></ul><ul><ul><ul><li>Negative x negative = positive </li></ul></ul></ul><ul><ul><ul><ul><li>+7 x +12 = +84 </li></ul></ul></ul></ul><ul><ul><ul><ul><li>-6 x –5 = +30 </li></ul></ul></ul></ul>
  3. 3. RULES CONTINUED… <ul><li>Rule 2: </li></ul><ul><ul><li>When multiplying or dividing integers whose signs are DIFFERENT , the answer will always be NEGATIVE . </li></ul></ul><ul><ul><ul><li>Positive x negative = negative </li></ul></ul></ul><ul><ul><ul><li>Negative x positive = negative </li></ul></ul></ul><ul><ul><ul><ul><li>+8 x –4 = -32 </li></ul></ul></ul></ul><ul><ul><ul><ul><li>-5 x +7 = -35 </li></ul></ul></ul></ul>
  4. 4. LET’S SING A SONG! <ul><li>Multiplying Integers Song </li></ul><ul><li>(sing to “ Dead Bones ” tune) </li></ul><ul><li>Verse 1   </li></ul><ul><li>A negative times a negative is a, (um) positive   </li></ul><ul><li>A negative times a positive is a, (um) negative </li></ul><ul><li>A negative times a negative is a, (um) positive </li></ul><ul><li>These are the rules for signs. </li></ul><ul><li>Verse 2   </li></ul><ul><li>If you have the same signs, you get a positive,   </li></ul><ul><li>But if they ’ re different, you get a negative, </li></ul><ul><li>If you have the same signs, you get a positive, </li></ul><ul><li>Yes, these are the rules for signs.   </li></ul>
  5. 5. LET’S PRACTICE! <ul><li>What sign would the answer have in front of the integer??? </li></ul><ul><li>-5 x -7 = ??? </li></ul>
  6. 6. <ul><li>POSITIVE!!! </li></ul>
  7. 7. HOW ABOUT… <ul><li>-6 x 9 = ??? </li></ul><ul><li>What sign will be in front of the answer?? </li></ul>
  8. 8. <ul><li>NEGATIVE!!! </li></ul>
  9. 9. TRY THIS ONE! <ul><li>What sign will be in front of the answer??? </li></ul><ul><li>-81 ÷ +9 = ??? </li></ul>
  10. 10. <ul><li>NEGATIVE!!! </li></ul>
  11. 11. LET’S SOLVE SOME PROBLEMS! <ul><li>-8 x –9 = </li></ul>
  12. 12. <ul><li>+72 </li></ul>
  13. 13. <ul><li>+4 x +12 = </li></ul>
  14. 14. <ul><li>+48 </li></ul>
  15. 15. <ul><li>-45 ÷ +5 = </li></ul>
  16. 16. <ul><li>-9 </li></ul>
  17. 17. <ul><li>-63 ÷ +7 = </li></ul>
  18. 18. <ul><li>-9 </li></ul>
  19. 19. <ul><li>-8 x –11 = </li></ul>
  20. 20. <ul><li>+88 </li></ul>
  21. 21. REMEMBER… <ul><li>When multiplying and dividing integers: </li></ul><ul><ul><li>Same signs = a positive </li></ul></ul><ul><ul><li>Different signs = a negative </li></ul></ul>

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