Percentage and Decimal Concepts

Mrs. Groovy Groves guides students through lesson eight, focusing on percent increase and decrease using equations. Examples include calculating the new price of sneakers after a 15% increase, determining the value of a savings bond with 105% interest, and comparing video game scores. The lesson also covers drawing diagrams to represent percent changes and estimating decimals. The video concludes with a discussion on circle measurements.

If a product's original price is $120 and it increases by 15%, what is the new price?

• $115

• $135

• $150

• $138

What is the decimal representation of 115%?

• 1.15

• 0.115

• 11.5

• 115

A $150 savings bond earns 105% interest. What will its value be after the interest is applied?

• $315

• $150

• $307.50

• $255

How do you express 205% as a decimal?

• 2.05

• 0.205

• 20.5

• 205

In a game, Claire scores 50% more points than Tyler. If Tyler's score is represented by 't', how can Claire's score be represented?

• c = 1.5t

• c = t + 0.5t

• c = 0.5t

• c = t + 50

Which equation correctly represents Claire's score if she scores 50% more than Tyler?

• c = 0.5t

• c = 1.5t

• c = t + 50

• c = t + 0.5t

If the number of miles driven this month is a 30% decrease from last month, what percentage of last month's miles does this month's miles represent?

• 130%

• 70%

• 30%

• 100%

A coffee shop used 25% more paper this month than last month. If last month's usage is represented by 'x', how is this month's usage represented?

• x + 0.25x

• 1.25x

• x + 25

• 0.25x

What is the best decimal estimate for the fraction 29/40?

• 0.75

• 0.7

• 0.72

• 0.725

Can a circle have a diameter of 7.2 inches and a circumference of 28 inches?

• Yes, because 7.2 times pi is approximately 28

• No, because 7.2 times pi is not close to 28

• Yes, because 28 is a multiple of 7.2

• No, because 28 is less than 7.2