Using Multiplication to Find Percent Increase

This video tutorial teaches how to express a percent increase as a product of the original amount. It reviews converting percentages to decimals and using multiplication to find the percent of a number. Common mistakes in understanding percent increase are addressed, emphasizing that the total amount paid is the original amount plus the increase. The tutorial provides examples, including calculating total cost with sales tax and writing expressions for a 12% increase over the original cost.

How can you express 20% as a decimal?

• 0.02

• 2.0

• 20.0

• 0.2

What is the correct way to calculate the total amount paid when there is a percent increase?

• Multiply the original amount by the percent increase

• Subtract the percent increase from the original amount

• Add the percent increase to the original amount

• Divide the original amount by the percent increase

If an item costs D and the sales tax is 5%, what expression represents the total cost?

• D + 0.05D

• D - 0.05D

• D / 0.05

• D * 0.05

How can you express a 12% increase over an original cost of x as a sum?

• x / 0.12

• x + 0.12x

• x - 0.12x

• x * 0.12

What is the expression for a 12% increase over an original cost of x as a product?

• 1.12x

• 0.88x

• 1.2x

• 0.12x