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Order of Operations
Lesson 1.4
ORDER OF OPERATIONS
Aim: How can we use order of
operations to simplify expressions?
Learning
 Students
Objectives
will:
 Evaluate expressions using the order
of operations on +, –, ×, and ÷.
 Use mental arithmetic to evaluate
expressions
Aim: How can we use order of
operations to simplify expressions?
Do Now:
 1. Name the property that lets you
write: 35 + 5 = 5 + 35
 2.
Use mental math to find each sum.
35 + 17 + 5
28 + 9 + 4
124 + 25 + 26
Order of Operation
Expression
What do you notice?
What do you wonder?
Write at least 3 statements
A
B
18 + 11 x 6 = (18 + 11) x 6
= 29 x 6
= 174
18 + 11 x 6 = 18 + (11 x 6)
= 18 + 66
= 84
nd the value of each expression.

A) 6 + 96 ÷ 3

B) 30 – (6 + 2) x 3

C) 34 + 5 x 2 - 17
Order of Operation
Expression
Aim: How can we use order of operations
to simplify expressions?
Create a numerical expression for
each model. Determine whether
the two expressions are
equivalent. If so what property is
applied?

1.
Name the property used in the statement
25 + 27 + 15= 25 + 15 +27
Give a reason to justify each
step
1.
(4 × 9) × 5 = (9x4) X 5
_____________________
9 x (4X5)____________________
9 x 20__________________
180 __________________
Use mental math to find:
1.
50 x 7 x 2
2.
(25 × 9) × 8
Four running clubs raised money in a
24-hour relay race. Club A ran 183
miles. Club B ran 144 miles, Club C ran
117 miles, and Club D ran 146 miles.
What was the total number of miles
that all four clubs ran?
 Which
pairs of numbers can you
add using mental math?
 What
pairs?
is the sum of each of those
se expressions to solve problems

What is the total cost of the items including the tax? Create an
expression to model this diagram.
ITEMS ORDERED
JEANS
3
$35 EACH
SHIRTS
4
$15 EACH
TAX
DISCOUNT
$10.00
- $5.00
Practice 1.4
 All-in-One
Student
Order of Operation
Expression
Workbook
 Page 197 & 198
 * DO NOT write in the
workbooks. All examples
must be done in your
notebook.
Exit Ticket

A student says that the value of the expression 5 +
25 ÷ 5= 6
What
error did the
student make?