Evaluating
Expressions
Ms. Rodriguez
February 04, 2016
Do Now
Matthew wants to buy a jersey that cost $280.
Modell’s is offering 25% off. Sport Authority is
offering $40 off. Which store should Matthew buy
the jersey from?
PLICKERS DRILL
 The purpose of this drill is to see whether you truly
understand Order of Operations.
Parentheses, Brackets, Grouping
P
E
M
A
Exponents
D
S
Multiplication or Division
Left to Right
Addition or Subtraction
Left to Right
Question #1
7–6+5
a. -4
b. 6
c. 4
d. 5
Question #2
5 × 2 – (9 - 4)
a. -3
b. 5
c. 15
d. -5
Question #3
9+2×6
a. 12
b. 21
c. 66
d. 17
Question #4
𝟒
𝟐 -2×3
a. 2
b. 10
c. 6
d. -2
Question #5
𝟐
𝟖+ 𝟐
𝟔
a. 2
b. 1.7
c. 12/6
d. 12
FOCUS QUESTION
How do we evaluate
expressions?
When evaluating an expression . . .
• Plug in numbers for variables
• Simply using the Order of Operations
• Solve
EXAMPLE #1
N
20
5
18
9
25 – N
EXAMPLE #2
N
2
6
4
3
7N + 2
Sarah went to the market to buy a certain amount
of eggs and goats. Each egg costs $0.15 while each
goat costs $5.00. Sarah uses the expression below
to determine her total cost at the market.
( 0.15 × E ) + ( 5.00 × G )
• If Sarah bought 6 eggs and 2 goats, how much
did she spend?
• If she bought 4 goats and 2 eggs, how much did
she spend?
PARTNER PRACTICE
• Each person is to submit their own work to
be graded.
• You are expected to work with an elbow
partner, but may choose to work alone.
• Voice Level 1
Use one of the expressions below to
write your own story.
(0.75 x D) + (0.25 x S)
(3 x C) + (5 x D)