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Multiplying and
Multiplying and
Dividing Integers
Dividing Integers
 When we multiply or divide two integers, the sign
rules are different than when we add or subtract signed
numbers.
 When we multiply or divide two positive integers, the
solution is positive.
7  6 = 42
2  9 = 18
20  1 = 20
Positive * Positive
Positive * Positive
12 歎 3 = 4
16 歎 8 = 2
8 歎 8 = 1
 When we multiply or divide two negative integers, the
solution is also positive.
(-7)  (-6) = 42
(-2)  (-9) = 18
(-20)  (-1) = 20
Negative * Negative
Negative * Negative
(-12) 歎 (-3) = 4
(-16) 歎 (-8) = 2
(-8) 歎 (-8) = 1
 When we multiply or divide one positive & one
negative integer, the solution is always negative,
regardless of which is larger or which is written first.
(-7)  6 = - 42
2  (-9) = -18
20  (-1) = -20
Positive * Negative
Positive * Negative
12 歎 (-3) = - 4
(-16) 歎 8 = -2
(-8) 歎 8 = -1
Summary
Summary
Adding Integers:
Positive + Positive = Positive
Negative + Negative = Negative
Positive + Negative = Sign of Larger #
Subtracting Integers:
Keep - Change - Change
Multiplying/Dividing Integers:
Positive + Positive = Positive
Negative + Negative = Positive
Positive + Negative = Negative
Multiply or divide.
1. (-10)3 2. (-4)(-3)
3. 7(-2) 4. 5(-2)
5. (-18)歎(-3) 6. (-20)歎2
Simplify each expression.
7. (3)(-5x) 8. (-2)(-3y)
9. (-1)(7x) 10. (10)(-5c)
You Try It!
Solutions
= -30
= 12
= -14
= 6
= -10
= -10
1. (-10)3
2. (-4)(-3)
3. 7(-2)
4. 5(-2)
5. (-18)歎(-3)
6. (-20)歎2
Solutions
= -15x
= -7x
= 6y
= -50c
7. (3)(-5x)
8. (-2)(-3y)
9. (-1)(7x)
10. (10)(-5c)
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Mulitplying-dividing integers grade 6.ppt

  • 1. Multiplying and Multiplying and Dividing Integers Dividing Integers
  • 2. When we multiply or divide two integers, the sign rules are different than when we add or subtract signed numbers. When we multiply or divide two positive integers, the solution is positive. 7 6 = 42 2 9 = 18 20 1 = 20 Positive * Positive Positive * Positive 12 歎 3 = 4 16 歎 8 = 2 8 歎 8 = 1
  • 3. When we multiply or divide two negative integers, the solution is also positive. (-7) (-6) = 42 (-2) (-9) = 18 (-20) (-1) = 20 Negative * Negative Negative * Negative (-12) 歎 (-3) = 4 (-16) 歎 (-8) = 2 (-8) 歎 (-8) = 1
  • 4. When we multiply or divide one positive & one negative integer, the solution is always negative, regardless of which is larger or which is written first. (-7) 6 = - 42 2 (-9) = -18 20 (-1) = -20 Positive * Negative Positive * Negative 12 歎 (-3) = - 4 (-16) 歎 8 = -2 (-8) 歎 8 = -1
  • 5. Summary Summary Adding Integers: Positive + Positive = Positive Negative + Negative = Negative Positive + Negative = Sign of Larger # Subtracting Integers: Keep - Change - Change Multiplying/Dividing Integers: Positive + Positive = Positive Negative + Negative = Positive Positive + Negative = Negative
  • 6. Multiply or divide. 1. (-10)3 2. (-4)(-3) 3. 7(-2) 4. 5(-2) 5. (-18)歎(-3) 6. (-20)歎2 Simplify each expression. 7. (3)(-5x) 8. (-2)(-3y) 9. (-1)(7x) 10. (10)(-5c) You Try It!
  • 7. Solutions = -30 = 12 = -14 = 6 = -10 = -10 1. (-10)3 2. (-4)(-3) 3. 7(-2) 4. 5(-2) 5. (-18)歎(-3) 6. (-20)歎2
  • 8. Solutions = -15x = -7x = 6y = -50c 7. (3)(-5x) 8. (-2)(-3y) 9. (-1)(7x) 10. (10)(-5c)