This post provides details about an artifact that has a manipulative and visual representation of tax rate and discount rate. These contexts are used as an introduction to percent change. The manipulatives are presented on a Google Jamboard.
The price or original price is presented as dollar bill. The bill is cut into proportional pieces to show the increase or decrease amount, visually, as a part of the original amount. The pieces can be moved around the Jamboard and replaced by other denominations.
The slides are presented in the slide show below. They are arranged in the following order. the slides show the different positions of the manipulatives, e.g., how the $20 bill is cut into discount and sales price.
- Slide 1: 5% Tax Rate for $20 price – compute the total to pay
- Slide 2: 20% off discount for $20 original price – compute the sales price
- Slide 3: generic tax rate
- Slide 4: generic discount rate
Access to Jamboard
Here is a link to the Jamboard. You must make a copy to access it.