28.

29.

2

Just in case is not clear the equation is:

Solve for l

32.33.

Home-Learning Review:

Quiz #3a:

Convert the given amount to the given unit:

1. 200 cm = ______ meters?

2. 5 ft 3 in = _________ in?

Solve each proportion:

32

36

45

y

3.

4.

5.

Quiz #3b:

Convert the given amount to the given unit:

1. 6 ½ ft = ______ in?

2. 4 lb 7 oz = _________ oz?

Hint:

lb = pound

oz = ounces

Solve each proportion:

32

36

45

y

3.

4.

5.

Vocabulary:

Percentage =

%

A percentage is a fraction in which the denominator is equal to 100.

For example,100

7%7

Decimals to percentage: Fractions to percentage:

.58

.08

.04

.6 25

12

4

3

5

4

2

1

YOUR TURNQuick Review:

Name:Date:Period:

Topic: Percent and Change Expressed as a percentEssential Question: What strategies could help you solve a percent problem or a percent change?

How do youfind the percent

using the percentproportion?

b

a

100

p

What percentage of 75 is 15?

What percentage of 56 is 42?

a = part of, b = base, p = percent

a = p · b

125% of what number is 17. 5?

20% of what number is 80?

A family sells a car to dealership for 60% less than they paid for it.They paid $9000 for the car. For what price did they sell the car?

A dress shirt that normally costs $38.50 is on sale for 30% off. What is the sale price of the shirt?How do you

find the “a” partusing the percent

equation?

How do youfind the “b” partusing the percent

equation?

1) What percentage of 16 is 10?

2) What percentage of 48 is 20?a = part of

b = base

p = percent

YOUR TURN

a = p · b

3) As you walk into a store you see the skate board you always wanted at a 35% discount from its original price of $39.99.

What is the sale price of the skateboard?

4) 60% of what number is 13.5?

5) 150% of what number is 34?

If you need help do not hesitate to ask for help!

How do you

find simple

interest?

I = Prt

You deposited $840 in a savings account that earns a simple interest rate of 4.5% per year. You want to keep the

money in the account for 4 years. How much interest will you earn?

I = interest

P = principal

r = annual interest rate

t = time in years

YOUR TURN

You deposited $125 in a savings account that earns a simple interest rate of 1.75% per year. You earned a total of $8.75 in interest.

For how long was your money in the account?

6) A savings account earns simple interest at a rate of 6% per year.

Last year the account earned $10.86 in interest. What was the balance in the account at the beginning of last year?

 is the ratio of the amount of change to the original amount .

Percentage Change

%100

ValueOriginal

value Original valueNew change Percentage

Vocabulary:

=

Example:Peter’s weight decreases from 60

kg to 48 kg. Find the percentage change of his

weight.

If the answer is positive, it means a percentage increase. If the answer is negative, it means a percentage decrease.

YOUR TURN

7) In one year, the toll for passenger cars

to use a tunnel rose from $3 to $3.50.

What was the percent increase?

8) The average monthly precipitation for Chicago, Illinois, peaks in June at 4.1 in. The average monthly

precipitation in December is 2.8 in. What is the percent decrease from June to December?

9) David bought a car for $90,000 three years

ago. He sells the car for $54,000 this year. What

is the percentage change of his car’s

price?

When the percentage change is positive, it means there is a profit.

When the percentage change is negative, it means there is a loss.

Real Life: Profit and Loss

Still Your Turn!

Real Life: Percent Error

10) A decorator estimates that a rectangular rug is 5ft by 8ft. The rug is actually 4ft by 8ft. What is the percent

error in the estimated area?

%100 ValueActual

Value Actual ValueEstimated Error Percentage

A) 0.25% B) 20% C) 25% D) 80%

Yeah, You Know It. It’s Your Turn!

Independent Practice:

Page 137 Solve It – Getting Ready

Page 148 (8, 16, 17, 18)

Page 149 (28, 39)

Page 150 (42)

Pair Work:

Presentations

Group 1:

Group 3:

Group 7:

Group 8:

Group 4:

Group 6:

Group 2:

If 5 pizzas serve 14 people, how many pizzas are needed for a pizza party with 76 people?

You are planting a vegetable garden with 12 rows. If it took 26 minutes to plant the first 4 rows, how long will it take to plant all 12 rows of the garden?

270 min; hours

103ft; yd

30 meters; cm

43 km; cm

12 lb 3 oz; oz

5000 centimeters; meters

• 15% of what number is 74?

Group 5:

• What is 30% of 241

A beauty salon buys bottles of styling gel for $6. 35 per

bottle and marks up the price by 35%. For what price does

the salon sell each bottle?

Group 9:

Group 10:

You deposit $645 in a savings account that earns simple

interest at a rate of 3.5% per year. How much interest will

you have earned after 7 years?Find the percent change: A $1700 computer is on sale for $1175. Find the percent change: The value of a

stamp collection increases from $150 to $170 in one year

Wrap-Up:

Vocabulary Review

Test Reminder

HLA#9:Conversions, Proportions, & Percents

Page 155-156 (40, 46, 49, 54, 60)