Percentage Calculations and Applications

This video tutorial covers seventh-grade fluency with percents, focusing on solving problems using proportional relationships. It includes exercises on model cars, student heights, calculating tips, and more. The lesson concludes with a final problem on signatures, emphasizing understanding and application of percentage concepts.

What is the main focus of the lesson on fluency with percents?

• Solving algebraic equations

• Understanding fractions

• Mastering percentages and proportional relationships

• Learning about geometry

If Corey has 80 model cars, which is 25% more than Everett, how many cars does Everett have?

• 60 cars

• 64 cars

• 70 cars

• 80 cars

In Jesse's class, 75% of the students are 60 inches or taller. If there are 20 students, how many are 60 inches or taller?

• 12 students

• 18 students

• 10 students

• 15 students

Bobby wants to leave a 15% tip on an $18 bill. How much should the tip be?

• $2.50

• $2.70

• $3.00

• $3.20

Express nine hours as a percentage of three days.

• 10%

• 20%

• 12.5%

• 15%

If there are 370 fans cheering for School A and 555 for School B, what percent of School B's fans are School A's fans?

• 60%

• 70%

• 66.67%

• 50%

A plant grows from 40 inches to 48 inches in a week. What is the percentage increase in height?

• 15%

• 20%

• 25%

• 30%

Lauren obtained 672 signatures, which is 40% more than needed. How many signatures were originally required?

• 550

• 480

• 500

• 520

Rectangle B has the same area as Rectangle A but its width is 62.5% of Rectangle A's width. If Rectangle A's width is 8 cm, what is Rectangle B's width?

• 7 cm

• 4 cm

• 6 cm

• 5 cm

If a rectangle's length is 25.6 cm and its width is 5 cm, what is the area of the rectangle?

• 150 cm²

• 100 cm²

• 120 cm²

• 128 cm²