percentages-price-before-and-after-sales-tax

# Interactive video lesson plan for: Percentages: Price before and after sales tax

#### Activity overview:

In this video you will learn how to calculate the final price when you have a sales tax, and how to calculate the original price given the sales tax and the final price.

Transcript
Welcome to moomoomath where we upload a new math video everyday. This first problem involves a price of 45 dollars, and a sales tax percentage of 7 %. I will use the percent formula original price + ( original price x tax) = Total Price
Original price = 45 add 45 times 7 % and I'm going to convert that to a decimal by moving the decimal two places to the left which will equal .07
Next 45 x .07 = 3.15. Bring the 45 down and add it to 3.15 and the final price equals 48.15
Next, we have a price of 25 dollars and a tax of 3%
I will use the formula, original price + ( original price x tax) = Total Price
Let's plug in what I know 25 + (25 x .03) again move the decimal place two places to the left.
25 x .03 = 75 cents, bring the 25 down and this will equal 25.75
So the final price of 25 dollars and 3 % sales tax equals 25.75
We have a final product of 25.75 and a 3 % sales tax.
We want to know what is the original price?
We will use our formula, original price + ( original price x tax) = Total Price
Plug in what we know
We know the original price is x
We x times the sales tax of .03 equals the final price of 25.75
I will put a 1 in front of the x so you can see what I'm doing.
Multiply x times .03 which equals .03x
1x + .03x = 25.75
Combine 1x and .03x which equals 1.03x = 25.75
Divide each side by 1.03 to get rid of 1.03 and 25.75 divided by 1.03 and this equals 25
So our original price will be \$25
Thanks for watching, MooMooMath uploads a new Math video everyday.

-~-~~-~~~-~~-~-
-~-~~-~~~-~~-~-

Tagged under: percentages,tax,calculating percent,math,elementary math

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

## Ready to see what elsecan do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

### Spiral Reviews by Teachers and Digital Learning Coaches

@kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

@ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

@strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!