Post on 13-Dec-2015
Magical Monday1. Take out your math notebook,
pencil, DEAR book.2. Warm UP: Green Book p. 402
(9-16)3. DEAR until we begin
Warm Up Answers: p.402 (9-16)
9) 10%
10) 43/100
11) 3/5
12) 76%
13) 0.32
14) 92%
15) 109/200
16) 7.5%
# correct
8
Before we begin today, some questions for you…
What does the word “percent” literally mean?
What is a very common unit of measure that uses 100 as its scale?
If I wanted to know how much 75% of $1.00 was, what could I think?
What about 75% of $2.00?
“per” – out of“cent” – 100
MONEY! There are 100 pennies in a
dollar
75 “out of 100” pennies is 75¢
75¢ + 75¢ = $1.50
New Process for a bit…• Class set of “books” that remain IN THE CLASSROOM
•Please keep them NICE because they are in use for a couple weeks
•Personal copy of the ACE questions that you may keep and TAKE WITH YOU (and even write on if you want)
•Let’s begin!
Runners, go get your lab sheets and “books” for your group members…
Make sure your notebook cover sheet looks like this:
#. Date Book Brief Description
1. 12-5 C&S Problem 4.1, ACE 1, 2, 15-17, 232. 12-6 C&S Problem 4.2, ACE 3-5, 18-193. 12-7 C&S Problem 4.3, ACE 6-14, 224. 12-12 B&PIII Problem 4.1, ACE
2,3,13,14,27,28(packet)
Big Idea: Calculate tax and total costYou will need: Calculator 4.1 Lab sheet
Remember…(write this down!)Changing a Decimal to a Percent
DP move the decimal 2 to the right then add the %Ex) .53 = 53% Ex) .009 = 0.9%Ex) 0.7 = 70% Ex) 4 = 400%
Changing a Percent to a Decimal
DP move the decimal 2 to the left and remove the %Ex) 68% = 0.68 Ex) 2% = 0.02Ex) 112% = 1.12 Ex) 8.67% = 0.0867
Charlotte 7.25%Washington 6.5%Michigan 6%Colorado 2.9%
Why do you
think there are
so many
differences?
Who decides
what percent
we pay?
CD $7.50
Tax $7.50 (.06) = $0.45
Total $7.95
Hint: Change the percent to a
decimal! Another way:
You would pay $0.06 on every dollar you spend, so multiply 6 cents by 7.5 dollars to get 45 cents. Then, add them together!
Tax: 2 (.06) = .12 Total: 2.00 + .12 = $2.12
Tax: 5 (.06) = .3 Total: 2.00 + .30 = $5.30
Tax: .5 (.06) = .03 Total: .50 + .03 = $.53
Tax: 2 (.07) = .14 Total: 2.00 + .14 = $2.14
Tax: 5 (.07) = .35 Total: 2.00 + .35 = $5.35
Tax: .5 (.07) = .035 Total: .50 + .035 = $.53 or $.54
Since Alexis had to pay $0.06 for each dollar, find how many “.06” are in 4.80 by dividing!
4.80/ .06 = $80 as the original cost!
$0.75 / .05 = $15 was to price of the game
We know he paid $.05 for every dollar he spent, so again, you divide the tax amount by $.05 to get $15!
Make sure your notebook cover sheet looks like this:
#. Date Book Brief Description
1. 12-5 C&S Problem 4.1, ACE 1, 2, 15-17, 232. 12-6 C&S Problem 4.2, ACE 3-5, 18-193. 12-7 C&S Problem 4.3, ACE 6-14, 224. 12-12 B&PIII Problem 4.1, ACE
2,3,13,14,27,28(packet)