Solving for Unknown Percentages Using Various Methods

This video tutorial teaches how to solve for unknown percentages using three methods: bar model, table, and proportion. It includes examples such as calculating gratuity percentage, height increase percentage, and percent error in density. The tutorial emphasizes the flexibility of the proportion method and the suitability of bar models and tables for simpler numbers.

Which method is considered more flexible for solving percentage problems?

• Bar model

• Table

• Proportion

• Graph

If a dinner bill is $12 and the gratuity is $4, what is the gratuity percentage?

• 33 1/3%

• 66 2/3%

• 25%

• 50%

What is the first step in calculating the percentage increase in Henry's height?

• Use the bar model

• Determine the actual increase

• Calculate the new height

• Find the original height

How much percentage does 1 inch of growth represent in Henry's height increase?

• 3%

• 2%

• 4%

• 1%

What is the actual error in Bianca's density measurement?

• 0.85 grams per milliliter

• 1.00 grams per milliliter

• 0.59 grams per milliliter

• 1.44 grams per milliliter

What is the percent error in Bianca's measurement of the nickel's density?

• 10.5%

• 13.5%

• 12.5%

• 13.2%

Which method is used to solve the problem of density measurement error?

• Table

• Bar model

• Graph

• Proportion