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Multiplying and Dividing Integers

Multiplying and Dividing Integers

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Multiplying and Dividing Integers

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  1. Multiplying and Dividing Integers Mrs. Young EMC 1

  2. Rules • When multiplying and dividing integers there are two rules: • When multiplying or dividing integers that have the SAME sign, the answer is POSITIVE. • Positive x positive = positive • Negative x negative = positive +7 x +12 = +84 -6 x –5 = +30

  3. Rules continued… • Rule 2: • When multiplying or dividing integers whose signs are DIFFERENT, the answer will always be NEGATIVE. • Positive x negative = negative • Negative x positive = negative +8 x –4 = -32 -5 x +7 = -35

  4. Let’s Sing a Song! Multiplying Integers Song (sing to “Dead Bones” tune) Verse 1 A negative times a negative is a, (um) positive A negative times a positive is a, (um) negative A negative times a negative is a, (um) positive These are the rules for signs. Verse 2 If you have the same signs, you get a positive, But if they’re different, you get a negative, If you have the same signs, you get a positive, Yes, these are the rules for signs.

  5. Let’s Practice! What sign would the answer have in front of the integer??? -5 x -7 = ???

  6. POSITIVE!!!

  7. How about… -6 x 9 = ??? What sign will be in front of the answer??

  8. NEGATIVE!!!

  9. Try this one! What sign will be in front of the answer??? -81 ÷ +9 = ???

  10. NEGATIVE!!!

  11. Let’s solve some problems! -8 x –9 =

  12. +72

  13. +4 x +12 =

  14. +48

  15. -45 ÷ +5 =

  16. -9

  17. -63 ÷ +7 =

  18. -9

  19. -8 x –11 =

  20. +88

  21. Remember… • When multiplying and dividing integers: Same signs = a positive Different signs = a negative