Percent Increase and Decrease Concepts

The video tutorial covers the concepts of percent increase and decrease through various examples, including jewelry, trading cards, sales, calorie reduction, investment value, cat population, and test scores. It explains how to calculate percent changes and find original amounts using equations and visual models.

What is the main topic of the lesson introduced by Mr. Holcomb?

• Percent increase and decrease

• Geometry and shapes

• Algebraic equations

• Statistics and probability

How many rings does Cassandra have in her jewelry box?

• Three

• Five

• Seven

• Ten

What is the purpose of drawing a double number line diagram?

• To relate numbers to percentages

• To compare different shapes

• To measure distances

• To solve algebraic equations

If Cassandra receives another ring, what will be the percent increase in her collection?

• 15%

• 20%

• 25%

• 10%

John increases his trading card collection by five cards. What is the percent increase if he originally had 15 cards?

• 40%

• 33.3%

• 25%

• 20%

Why is representing change as a percent useful?

• It helps in understanding the size of the change relative to the whole.

• It makes calculations more complex.

• It is only useful for financial data.

• It simplifies the data to a single number.

Ken's trainer asked him to reduce his calorie intake by no more than 7%. Did Ken achieve this if he reduced from 2500 to 2200 calories?

• No, he reduced by more than 7%

• Yes, he reduced by less than 7%

• No, he did not reduce at all

• Yes, he reduced by exactly 7%

What is the current value of an investment that decreased by 10% from an original amount of $75?

• $67.50

• $70.00

• $72.50

• $75.00

If Justin earns two more badges, what will be the percent increase in his badge collection?

• 35%

• 30%

• 25%

• 20%

The cat population in a neighborhood declined by 30% to 12 cats. How many cats were there originally?

• 15

• 17

• 20

• 25