Solving Percent Change and Percent Error Problems

This video tutorial covers solving problems related to percent change and percent error. It includes examples of calculating percent increase and decrease, as well as determining percent error in estimates. The lesson aims to equip students with the skills to solve these types of problems using practical examples and mathematical equations.

What is the main focus of Lesson 44 in pre-algebra?

• Learning about geometric shapes

• Solving percent of change and percent of error problems

• Understanding linear functions

• Solving quadratic equations

If an alligator's length increased from 32 inches to 38 inches, what is the percent increase?

• 25%

• 20%

• 18.75%

• 15.5%

What is the new length of the alligator if it grows by the same percent next year?

• 40.5 inches

• 38 inches

• 42 inches

• 45 inches

If a website had 40,000 visitors last year and 37,000 this year, what is the percent decrease?

• 10%

• 7.5%

• 12.5%

• 5%

How can you represent a percent decrease in a problem?

• Using a fraction

• Using a negative sign or the word 'decrease'

• Using a multiplication sign

• Using a positive sign

Sean estimated 3,000 attendees at a lacrosse game, but the actual number was 3,296. What is the percent error?

• 9%

• 8%

• 11%

• 10%

When calculating percent error, which value should be used as the 'whole'?

• The difference between the estimated and actual values

• The actual value

• The average of the estimated and actual values

• The estimated value

A machinist makes a bolt that is 4.76 inches long, but the specification is 4.75 inches. What is the percent error?

• 0.5%

• 0.4%

• 0.3%

• 0.2%

In the bolt length example, what is the 'part' used in the percent error calculation?

• 0.019

• 0.01

• 4.76

• 4.75

What should you do if you have questions about the lesson?

• Ask for help

• Ignore them

• Wait until the next lesson

• Guess the answers