Chapter 1: Sections 3&4 Evaluate Integers Ab Value

Chapter 1 Section 3: Evaluating Expressions Section 4: Integers and Absolute Value By Ms. Dewey-Hoffman, 2009 http://msdhpowerpoints.blogspot.com/

Evaluating Variable Expressions
Evaluate a Variable Expression
Replace each variable with a number.
Use Order of Operations to Simplify.
Example Problems:
Evaluate 4 y – 15, y = 9
4 (9) – 15  Replace variable with a number.
4 (9) = 36  Order of Operations. Multiplication.
36 – 15 = 21  Simplify. Subtraction.

Example Problems: Try These, Show Steps.
6(g + h), for g = 9, h = 7
2xy – z, for x = 4, y = 3, z = 1
r + s , for r = 13, s = 11
2

Word Problems
Bottles of energy drinks come 24 bottles to a case.
How many cases does a store need to order if they want 120 energy drink bottles?
An online store that sells only gummies (worms and bears) and charges $0.75 for every pound that is ordered, plus a fee of $6.00 for shipping costs. Write an expression that relates the total price of an order in p pounds.

Integers
Integers
Whole numbers and their opposites. No decimals or fractions.
Opposites
The distance a number is from zero, but on the opposite side of zero.
Opposite of 7 is –7, opposite of –9 is 9.
There is no opposite of zero!
A negative sign means “opposite”.
Example Problems: Simplify
The opposite of –9
The opposite of positive 27
-(-6)
-(-(-7)

Absolute Value
Absolute Value
Is the measured distance a number is from zero.
The absolute value of 7 is 7.
The absolute value of –9 is 9.
DISTANCE IS ALWAYS POSITIVE.
Treat absolute value bars as grouping simples (or parentheses!).
Simplify inside the bars using Order of Operations.

Absolute Value Example Problems
|-3|
-|-3|
4 - |-2|
The opposite of the absolute value of negative seven.
The opposite of the opposite of the absolute value of positive 8.

Assignment #2
Pages 15-16: 11-33 odd. Show steps.
Pages 19-20: 12-38 even. Show steps.
Extra Credit: Page 21: 56-59 all. Just answer, do not need to copy problem.
Remember!
Box answers.
Copy problems.
Show steps!
Due September 3 rd , 2009.

Chapter 1: Sections 3&4 Evaluate Integers Ab Value

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