Chapter 2 Lesson 5 Dividing Integers pgs. 80-84

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Chapter 2 Lesson 5Dividing Integerspgs. 80-84

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

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Vocabulary

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

This is not related to how you treat your
sibling(s)!!
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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
4
Divide these integers with the same sign

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

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15
2
6
Concept check How do you know the sign of
the quotient of two integers?
5
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
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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
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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.
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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
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HOMEWORK
QUIZ TOMORROW OVER SECTIONS 2-4 AND 2-5!! STUDY
OR ELSE(you might earn a bad grade)