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Chapter 2 Lesson 5Dividing Integerspgs. 80-84

- What youll learn
- Divide Integers
- Find the average of a set of data

Vocabulary

- Mean (82)--the average of a set of data

This is not related to how you treat your

sibling(s)!!

Key Concepts (80, 81)

Dividing Integers with the SAME sign The

quotient of two integers with the same sign

is positive. -12 4 12 4

-3 3 Dividing integers with Different

signs The quotient of two integers with

different signs is negative. -12 -3

12 -3 4 -4

Divide these integers with the same sign

- a. -32/(-8)
- b. 75
- 5
- -18?(-9)
- d. 60/10

4

15

2

6

Concept check How do you know the sign of

the quotient of two integers?

Divide these integers with different signs

- 42
- -3
- -48
- 6
- -30?6
- 40/(-8)

-14

-8

-5

-5

Remember, if the signs are different, Then the

quotient is NEGATIVE

Evaluating Algebraic Expressions

Evaluate ab if a -6 and b -8

-4 Replace the a with -6 and the b with

-8. (-6)(-8) -4 Multiply (-6)(-8) which

equals 48. Now the problems looks like this

48 Which equals -12 -4

Mean

To find the mean of a set of numbers, find the

sum of The numbers and then divide by the number

in the set. Rachel had test scores of 84, 90, 89

and 93. Find the Average (mean) of her test

scores. First, find the sum of the test scores

and divide by the Total number of test

scores. 84908993---test scores 4 ---total

number of tests 356 --sum of test scores

89 4 --number of tests The average of

her test scores is 89.

Extra Practice

- Evaluate each expression if a -2, b 5 and c

-4 - ac
- -8
- 250
- ab

-1

-25

- Find the mean of the data
- 23, 20, 27, 18
- -8, 9, 4, 0, 2, -1

22

1

HOMEWORK

QUIZ TOMORROW OVER SECTIONS 2-4 AND 2-5!! STUDY

OR ELSE(you might earn a bad grade)

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