Percentage Calculations

Applications of Percent Review

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What is a Percent

• Percent means part of 100

• Percent is a ratio that compares a number to 100

• Percent can be expresse as a decimal and as a fraction

Multiple Choice

What does the Word Percent mean?

• Part out of 10

• Part out of 1

• Part out of 100

• Part out of 1,000

Solving percent Problems: Method 1

• The percent Proportion

• Fill out the proportion with information given

• Cross multiply and divide to solve proportion

Multiple Choice

What is 25% of 100?

• 25

• 2

• 50

• 13

Multiple Choice

20 is 50% of what number?

• 10

• 40

• 20

• 30

Solving Percent Problems Method two: the Percent Equation

• Part = Percent x whole

• If a percent is given, change to a decimal

Multiple Choice

Set up the percent equation for this example: What is 15% of 90?

• .015 = 90 x n

• 90 = 0.15 x n

• 15 = n x 90

• n = 0.15 x 90

Multiple Choice

What is 15% of 90?

• 0.16

• 13.5

• 1,350

Multiple Choice

Ralph buys a computer for $675. The sales tax rate is 6%. How much total did Ralph pay for the computer?

• 40.50

• 715.50

• 6.00

• 634.50

Multiple Choice

Mrs. Brooks bought a microwave that was originally priced at $225. She received a 30% discount. What is the sale price of the microwave?

• $67.50

• $195

• $157.50

• $292.50

Multiple Choice

Dan made 85% of his free throws. If he took 45 shots, how many did he make?

• 40 shots

• 85 shots

• 7 shots

• 38 shots

Multiple Choice

Mr. Richards Bought a package of 15 pens. 20% of the pens were blue and the others are black. How many pens are blue?

• 3

• 7

• 5

• 9

Percent Of Change

• Subtract the new and Original

• Divide result by the Original

• Multiply by 100

Multiple Choice

The price of wrapping paper went from $10 a roll to $8 a roll. What is the percent of change?

• 20% decrease

• 10% decrease

• 25% Decrease

Multiple Choice

Mr. RIchards Played golf twice in the last month. His first score was an 85 and his second score was a 92. What is the percent of change?

• .08% increase

• About 7% increase

• About 8% increase