(7) Unit 2 Study Guide & Practice Test

Lesson 1: Percent of a Number
Lesson 2: Proportions
Lesson 3: The Percent Proportion
Lesson 4: The Percent Equation (Triangle)
Lesson 5: Percent of Change
Lesson 6: Tax, Tips, Markup, & Discount
Lesson 8: Simple Interest

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Unit 2 Study Guide & Practice Test

Lesson 1: Percent of a Number

Things to know...
1.) change the percent to a decimal
2.) OF means MULTIPLY

Example:
25% of 30
.25 x 30
7.5

Lesson 2: Proportions

Cross Multiply and Divide

If you have a word problem...
Set up a pattern and stick with it!!

Lesson 3: The % Proportion

Lesson 4: The Percent Equation

is = % x of

​Is

% of

Lesson 5: Percent of Change

​Amount of Change (Big # - Small #)
Original Amount (1st Number you see)

Multiple Choice

Find the percent of change. Round to the nearest whole percent if necessary.

30 inches to 24 inches

• 20% Increase

• 20% Decrease

• 25% Increase

• 25% Decrease

Multiple Choice

Find the percent of change. Round to the nearest whole percent if necessary.

$126 to $150

• 19% increase

• 19% decrease

• 16% increase

• 16% decrease

Lesson 6: Tax, Tip, & Markup

1. change the % to a decimal

2. multiply by the amount

3. ADD to the cost

Lesson 7: Discount

1. Change the percent to a decimal

2. multiply by the cost

3. SUBTRACT to find the new price

Multiple Choice

Mary and Roberto bought identical backpacks at different stores. Mary's backpack originally cost $65 and was discounted 25%. Roberto's backpack originally cost $75 and was on sale for 30% off. Who had the better buy?

• Mary

• Roberto

​Lesson 8: Simple Interest

I= interest
p= principle
r= rate (% as a decimal)
t= time (in years)