Understanding Percent Change Concepts

Miss Goal's lesson covers percent increase and decrease, using examples like Cassandra's ring collection and Ken's calorie intake. Students learn to solve percent problems and calculate original amounts given a percent change. The lesson includes exercises on double number lines and practical examples to illustrate concepts.

What is the purpose of using a double number line in the context of percent problems?

• To calculate the exact percentage

• To visualize the relationship between two quantities

• To compare different percentages

• To solve algebraic equations

If Cassandra's ring collection increases from 5 to 6 rings, what is the percent increase?

• 25%

• 20%

• 15%

• 10%

What does a negative result in the percent change formula indicate?

• An increase

• An error in calculation

• A decrease

• No change

Ken's calorie intake decreased from 2500 to 2200 calories. What is the percent decrease?

• 7%

• 15%

• 10%

• 12%

If a population decreases by 30%, what percentage of the original population remains?

• 50%

• 30%

• 90%

• 70%

In the cat population example, what was the estimated original number of cats if the current population is 12?

• 25

• 15

• 17

• 20

Liu's math test score increased by 25% to reach 650. What was her original score?

• 600

• 550

• 520

• 500

What is the formula for percent change?

• New value minus old value

• Old value minus new value

• New value minus old value divided by old value

• Old value minus new value divided by new value

What does the coefficient 1.25 represent in the context of Liu's score increase?

• The factor by which the original score is multiplied

• The percentage increase

• The increased score

• The original score

Why is it important to understand percent increase and decrease?

• To memorize mathematical formulas

• To calculate exact values

• To make informed decisions in everyday life

• To solve complex algebraic equations