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Copy HW in your plannerCopy HW in your planner..Text p. 68, #2-56 evens, 63 & 64Text p. 68, #2-56 evens, 63 & 64

Be ready to copy POTW #5Be ready to copy POTW #5

Objective

SWBAT multiply and divide integers

Section 2-4 “Multiplying and Section 2-4 “Multiplying and Dividing Integers”Dividing Integers”

Rule #1Rule #1 The product or quotient of two integers The product or quotient of two integers

with the same sign is always POSITIVE!with the same sign is always POSITIVE!

8 x 3 = 24 -8 · (-7) = 568 x 3 = 24 -8 · (-7) = 56

18 18 ÷ 6 = 3÷ 6 = 3

46

24

Rule #2Rule #2 The product or quotient of two The product or quotient of two

integers with different signs is integers with different signs is always NEGATIVE!always NEGATIVE!

(-9)(3) = -27 8 · (-7) = -56(-9)(3) = -27 8 · (-7) = -56

-6 -6 ÷÷ 3 = -2 3 = -2 76

42

Section 2.4 “Multiplying and Section 2.4 “Multiplying and Dividing Integers”Dividing Integers”

Negative or Positive?Negative or Positive? Without solving the problem, decide whether the

product or quotient will be positive or negative.

17(-2)17(-2)

negativenegative

-13 -13 ÷÷ 11 11

negativnegativee

-14 -14 ÷÷ (-14) (-14)

positivepositive

-73 -73 ·· (-84) (-84) positivepositive

Zero or Undefined?Zero or Undefined? Without solving the problem, decide whether the

product or quotient will be zero or undefined.

17(0)17(0)

zerozero

0 0 ÷÷ 11 11

zerozero

-14 -14 ÷÷ 0 0

undefinedundefined

0 0 ·· (-84) (-84) zerozero

PracticePractice

1). 8 1). 8 ·· 9 = 9 =

2). -8 2). -8 · · 10 =10 =

3). 0(-4) =3). 0(-4) =

4). (-7)(-7) =4). (-7)(-7) =

5). (-4)3 =5). (-4)3 =

7272-80-80

00

4949

-12-12

6). 8 6). 8 ÷÷ (-2) = (-2) =

7). -80 7). -80 ÷ (-÷ (-10) =10) =

8). -8 / (-4) =8). -8 / (-4) =

9). -840 9). -840 ÷ 0 ÷ 0 ==

10). 10).

-4-4

8822

undefinedundefined

8832

256

Evaluate the Expression

-4-4(3)(3)(-5)(-5)-12(-5)-12(-5)

6060

-4mn-4mn m = 3 and m = 3 and n = -5n = -5

SubstituteSubstitute

Evaluate the Expression

PPEEMDMDASAS

x x -8y-8y

Grouping symbolGrouping symbol

[(-8)[(-8)(-9)(-9)] ] ÷ (÷ (-12-12) )

72 72 ÷ (-12) ÷ (-12)

-6 -6

x = -12 and x = -12 and y = -9y = -9

SubstituteSubstitute

PracticePractice

xyzxyz

Evaluate the expressions when x = -3, y = -5, z = 7Evaluate the expressions when x = -3, y = -5, z = 7

(-3)(-5)(7)(-3)(-5)(7)

15 15 · · (7) (7)

105105

x

xy

5

3

)3(5

)5)(3(3

15

45

33

Homework Text p. 68, #2-56 evens, 63 & 64Text p. 68, #2-56 evens, 63 & 64

NJASK7 Prep

“Real Number” Cards“Real Number” Cards Red cards = Negative Black cards = Positive Jack = 11, Queen = 12, King =13, Ace = 1 or 14 Dealer deals each player 2 cards. The player with the highest answer gets all the

cards from that round. The player with the most cards at the end of the

deck wins! Multiply 1st two cards together.