Pre-Algebra
Order of Operations
Day 2
1
What Are You Learning?
I CAN evaluate
word problems
using the order of
operations.
2
Why Do You Need To Know This?
Using the order of operations to solve
word problems is important because these
problems apply to may real world
situations. If the order of operations is not
applied correctly, the answer will be
incorrect.
3
Back to School Sale
Your school bookstore’s prices are shown below. You
purchase 5 folders, 3 notebooks, and a calculator.
Write an expression that represents your total cost.
Then simplify the expression to find out how much money
you will spend.
Folder--$.50
Highlighter--$1.49
Notebook--$2.25
Calculator--$5.99
4
Let’s Go Eat!!
Mr. Perdue took his family out to eat.
They ordered three meals costing $8.99
each, two sodas at $1.50 each, and one
glass of tea for $1.25.
Write an expression to find the total
amount the Perdue family spent on dinner
and then evaluate the expression.
5
Let’s Go to the Movies
You and three friends go to the movies. The group has
$40 total. The cost per ticket is $5.25. Each person
wants a large soda for $1.25 each, and a box of candy
for $1.15 each.
Two of the four are willing to share a large buttered
popcorn for $3.75 and the other two are going to share a
medium unbuttered popcorn for $3.00.
Write an expression that represents the total. How much
money did the group spend? How much money
remains?
6
I Smell a Sale!!
A store has certain a. Write an expression
you could use to find
software on sale at
the cost of 5
3 for $20, with a
software packages.
limit of 3 at the sale
price. Additional
b. How much would 5
software is
software packages
available at the
cost?
regular price of
$9.95 each.
7
Bacteria
 Most bacteria reproduce
by dividing into identical
cells. This process is
called binary fission.
 A certain type of bacteria
can double its numbers
every 20 minutes.
 Suppose 100 of these
cells are in one culture
dish and 250 of the cells
are in another culture
dish.
 Write and evaluate an
expression that shows
the total number of
bacteria in both dishes
after 20 minutes.
8
Make Mine a Large!!
At a local coffee house, coffee can be
purchased by the pound.
Megan buys 3 pounds of Mexican coffee
priced $5 per pound. Nick buys 7 pounds
of Spanish coffee priced at $9 per pound.
How much more did Nick spend than
Megan?
9
Let’s Get To Work!!
 As a 16 year old,
Trent Eisenberg ran
his own consulting
company called F1
Computer.
 Suppose he charged
a flat fee of $50, plus
$25 per hour.
 One day he worked 2
hours for one
customer and the
next day he worked 3
hours for the same
customer.
 Write an expression
and find the total
amount of money he
earned.
10