Percent Change and Decrease Problems

This video tutorial on 'Mushroom Math' covers lesson 5.1 on percent increase and decrease. It explains how to use percents to describe changes in quantities, with examples such as Amber's wage increase and David's commute decrease. The video also includes practice problems for viewers to solve and concludes with a call to action.

What is the formula for calculating percent change?

• Amount of change plus original amount

• Original amount divided by amount of change

• Amount of change divided by original amount

• Original amount minus amount of change

If a quantity doubles, what is the percent increase?

• 100%

• 50%

• 150%

• 200%

Amber's hourly wage increased from $8 to $9.50. What is the percent increase?

• 15%

• 19%

• 18.75%

• 20%

The price of a pair of shoes increased from $52 to $64. What is the percent increase?

• 25%

• 23%

• 22%

• 20%

What does a 100% decrease mean?

• The quantity is reduced to zero

• The quantity is doubled

• The quantity is halved

• The quantity remains the same

David moved from a house 89 miles away to 51 miles away. What is the percent decrease in distance?

• 42%

• 44%

• 43%

• 45%

If a quantity decreases by 50%, what fraction of the original quantity remains?

• 1/4

• 1/2

• 3/4

• 1/3

The number of students in a club decreased from 18 to 12. What is the percent decrease?

• 33%

• 34%

• 35%

• 30%

Officer Brimberry wrote 16 tickets last week and 10 this week. What is the percent decrease?

• 35%

• 38%

• 36%

• 37%

If a quantity decreases by 100%, what happens to it?

• It doubles

• It halves

• It becomes zero

• It remains unchanged