Section 1.3 : Order of Operations
Objective: Students will be able to use the order of operations to
evaluate expressions.
Main Ideas/
Questions
Vocabulary
Notes/Examples
Order of Operations: set of _____________
Used to _____________ ______________
involving more than one ________________.
Examples
Using Grouping Symbols
Evaluate the expressions using Order of Operations.
1.
14 + 6
12 - 7
2. 5[36 - (13 + 9)]
Practice
Evaluate the expression
1. 28 - 63 ÷ 7
2. 2. 72 ÷ [(11 - 7)⋅2]
Example
Evaluate variable expressions
Evaluate the expression when x = 2 and y = 5.
4(x+y)
Practice
Evaluate the expression when x = 4 and y = 2.
1. 3x - 2y
2. x2 - y
3. 3(x+y)2
Example
Write and Evaluate an Expression using Order of
Operations
You buy a pattern and enough material to make two
pillows. The pattern costs $5. Each pillow requires
$4 worth of fabric and a button that costs $.50.
Find the total cost.
Solution:
Step 1: Read and understand the problem.
Step 2: Write a verbal model.
Step 3: Solve the problem.
The total cost is ________________________.
Practice
A boojum is a very slow-growing cactus. One fiftyyear-old boojum is 1.5 meters tall and has been
growing about 0.03 meter each year. Assume the
growth pattern continues.
a. Write an expression for the height in
meters of the boojum y years from now.
b. Apply How tall will the boojum be in 50
years?