Percent of change

The video tutorial explains how to calculate the percent change from 19 to 5. It begins by identifying the change as 14 and then moves on to explain how to express this change as a percentage using ratios and proportions. The tutorial demonstrates the use of cross multiplication to solve for the percent decrease, resulting in a 73.7% decrease. The explanation is supported by examples and calculations to ensure understanding.

What is the initial step in finding the percent change between two numbers?

• Divide the numbers

• Calculate the sum of the numbers

• Find the difference between the numbers

• Multiply the numbers

How can a change be represented when using ratios?

• As a difference of the numbers

• As a ratio of the change to the total

• As a sum of the numbers

• As a product of the numbers

What is the purpose of using proportions in calculating percent change?

• To find the total amount

• To compare two different percentages

• To add two ratios together

• To equate two ratios for solving unknowns

Which mathematical operation is used to solve for the percentage change in this tutorial?

• Subtraction

• Addition

• Division

• Cross multiplication

What is the percent decrease from 19 to 5 as calculated in the tutorial?

• 25%

• 100%

• 73.7%

• 50%