Percent Change and Population Decrease

This video tutorial by Miss Goal covers Module 4, Lesson 3 on percent increase and decrease. It begins with an introduction to the learning outcomes, followed by exercises using a double number line to understand percentages. The tutorial includes examples of calculating percent increase and decrease, such as Cassandra's ring collection and Ken's calorie intake. It also covers finding the original amount given a percent change, using examples like cat population and test scores. The lesson concludes with a focus on the percent change formula.

What is the main focus of today's lesson?

• Studying geometry

• Solving algebraic equations

• Learning about percent increase and decrease

• Understanding fractions

What does the double number line help illustrate?

• The addition of integers

• The relationship between fractions and decimals

• The concept of multiplication

• The representation of percentages using rings

If you have 5 rings, what percentage does each ring represent?

• 25%

• 20%

• 15%

• 10%

What is the percent increase in Cassandra's ring collection after receiving one more ring?

• 10%

• 15%

• 20%

• 25%

What formula is used to calculate percent change?

• Percent change = (to * from) / from

• Percent change = (from - to) / to

• Percent change = (to - from) / from

• Percent change = (to + from) / from

Ken's trainer asked him to reduce his calorie intake by what percentage?

• 7%

• 5%

• 10%

• 12%

Did Ken successfully reduce his calorie intake by the trainer's recommended percentage?

• Yes, he reduced it by 10%

• No, he reduced it by 12%

• No, he reduced it by 5%

• Yes, he reduced it by 7%

What was the percent decrease in Ken's calorie intake?

• 5%

• 7%

• 10%

• 12%

What is the estimated current cat population in the neighborhood?

• 10

• 12

• 15

• 20

By what percentage did the cat population decrease?

• 30%

• 25%

• 35%

• 20%