Search Header Logo
Finding Original Amounts with Percent Change

Finding Original Amounts with Percent Change

Assessment

Interactive Video

Mathematics

9th - 10th Grade

Practice Problem

Hard

Created by

Emma Peterson

FREE Resource

This video tutorial teaches how to find the original amount and the amount of change given the percent of change and the final amount. It uses an example involving a couch purchase with sales tax to demonstrate solving the problem using both proportions and equations. The tutorial also reviews solving proportions and equations, clarifies common misconceptions about percent change, and provides step-by-step solutions to the example problem.

Read more

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main problem discussed in the video?

Calculating the final amount after tax

Learning how to calculate interest rates

Finding the original amount and the amount of change given the percent of change and the final amount

Understanding how to apply discounts

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a common mistake when dealing with percent change?

Calculating the percent change before finding the original amount

Assuming the percent change is the same as the amount of change

Confusing the final amount with the amount of change

Using the wrong formula for percent change

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What method is used to find the original amount using proportions?

Division and multiplication

Addition and subtraction

Substitution

Cross-multiplication

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you find the amount of tax using proportions?

Add the tax rate to the original amount

Divide the final amount by the tax rate

Multiply the original amount by the tax rate

Subtract the original amount from the final amount

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method involves using cross products to find the original amount?

Equation method

Proportion method

Graphical method

Substitution method

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in using equations to find the original amount?

Multiply the final amount by the percent

Convert the percent to a decimal

Add the percent to the final amount

Subtract the percent from the final amount

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the percent converted to a decimal in the equation method?

By multiplying the percent by 100

By moving the decimal point two places to the left

By dividing the percent by 10

By adding 100 to the percent

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Google

Continue with Google

Email

Continue with Email

Classlink

Continue with Classlink

Clever

Continue with Clever

or continue with

Microsoft

Microsoft

Apple

Apple

Others

Others

Already have an account?