Transcript File - concept 1.b. ~ the real world.

Numbers and Operations.
Our powerpoint is going to teach you
how to apply concepts and perform
basic operations using real numbers in
real-world contexts.
Miracle Ingram, Max Grady, and Emily Marsiglia.
Example number 1:
• There were 45 fluorescent light fixtures in a
warehouse. Each fixture required 2
fluorescent tubes. Mr. Moto replaced all of the
fluorescent tubes in the warehouse. Each tube
cost $1.19, including tax.
How much did it cost to replace all of the
tubes in the warehouse?
Your answer choices are:
A.
B.
C.
D.
$53.55
$97.10
$107.10
$127.10
What you want to do, to solve this problem, is first
pay attention to your important numbers.
45- how many fixtures there are.
2- how many tubes in 1 fixture.
$1.19- how much 1 tube costs.
What you want to do now, is take how many
fixtures there are in the warehouse, and
multiply it by how many light tubes are in each
fixture, to figure out how many total light tubes
you need.
45
x
2
90 total light tubes needed.
Your next step will be to take how many tubes
are needed, and multiply it by the cost of 1
tube, to figure out, how much it will cost to
replace all 90 light tubes.
90
x $ 1.19
$107.10 to replace all of the light tubes.
Example number 2:
Drake spent a total of $37.50 on the entrance
ticket and ride tickets at the county fair. The
entrance ticket was $13.50, and the ride tickets
were $1.50 each.
What is the number of tickets Drake bought?
What you want to do first is figure out how
much he spent on tickets alone. To do this, you
want to take how much he spent in total, and
subtract the amount he spent on the entrance
ticket.
$37.50
- $13.50
$24.00 left for ride tickets.
What you’re going to do next, is divide how
much money he had by how much each ride
ticket costs, in order to get the amount of ride
tickets Drake bought at the county fair.
$24.00/1.50 = 16 total ride tickets.
Example number 3:
The Thomas family went for a Sunday drive.
Before they left, Mr. Thomas noticed the gas
tank was 3/4 full. When they returned home,
the tank was 1/3 full.
If the gas tank holds 18 gallons, how many
gallons of gas did the car use on the drive?
The first thing you need to do, is find a common
denominator between 3/4 and 1/3.
Your common denominator will be twelve. This
giving you the fractions 9/12 and 4/12.
The next step to solving your problem, is to
subtract 9/12- 4/12.
-
9/12
4/12
5/12
Finally, the last thing you need to do, is figure
out what is 5/12 of 18. To do this, enter in your
calculator:
18 divided by 5/12
Your answer should be 7.5 or 7 ½.
You try!
Mario ordered 16 chains. Half of them
measured 2 feet, and the rest measured 3 feet.
The cost for each chain was $1.50 per foot.
Mario determined that the total cost of the
chains was $60.00.
Which expression could be used to justify that
Mario’s conclusion is correct?
Answer choices:
A.
B.
C.
D.
(1.5)(3)+(1.5)(2)(16)
(16)(3+2)(1.5)
(8)(3+2)(16)
(8)(3+2)(1.5)
Correct answer:
D.
You try!
Marge purchased 60 shares of stock at $62.50
per share. What was the total amount, she
invested in shares of stock?
Answers:
A.
B.
C.
D.
$3750.00
$1687.50
$281.25
$168.75
Correct answer:
A.