Percentage Increase and Decrease Concepts

This video tutorial covers proportional relationships and percentages, focusing on using ratios, scale factors, and unit rates to solve real-world problems involving fractions and percentages. Key vocabulary includes measurement error, percentage decrease, percentage increase, and repeating decimals. The video explains how to calculate proportional relationships with fractions and decimals, and how to describe increases and decreases as percentages. Real-world applications such as tax, interest, markup, and discounts are also discussed.

What is a unit rate also known as?

• Measurement error

• Constant of proportionality

• Repeating decimal

• Scale factor

Which of the following is NOT an essential vocabulary term introduced in this unit?

• Linear equation

• Repeating decimal

• Percentage decrease

• Measurement error

If a baker uses 1/6 less sugar than a recipe calls for, what is the constant of proportionality?

• 1/6

• 5/6

• 1/3

• 2/3

How is the repeating decimal 0.833... represented in fractional form?

• 5/6

• 1/6

• 1/3

• 2/3

What is the constant of proportionality if a baker uses 1 and 2/3 cups of sugar instead of 2 cups?

• 1/3

• 5/6

• 2/3

• 1/6

What is the percentage increase if a club with 50 students gains 6 more students?

• 12%

• 10%

• 20%

• 15%

A club with 8 students gains 6 more. What is the percentage increase?

• 80%

• 75%

• 50%

• 60%

What is the percentage of the starting amount if a club with 50 students now has 56 students?

• 115%

• 120%

• 112%

• 110%

If a club with 8 students now has 14 students, what percentage of the starting amount is this?

• 150%

• 160%

• 170%

• 175%

What is the percentage increase if a club with 50 students gains 6 more students?

• 10%

• 12%

• 15%

• 20%