AIM: How can we find percents of numbers?
HW: Tax, Discount, Markup worksheet #9-24
Do Now: A pair of sneakers cost $85. They are on sale for $15 off. how much do the sneakers cost after the discount?
Announcement: We are beginning a new mini-unit on percents. In this unit, we will discuss tax, markup, discount, commission, and tip --among other things.
Classwork: Today's Do Now tapped prior knowledge related to discounts being subtracted from original prices. After reviewing answers to the previous night's homework, we discussed the idea of sales as a technique to get consumers to buy more products. Giving the holiday season has begun, students are exposed to prime examples both online and in physical retail stores daily. We investigated two situations: a jacket being sold online that was originally $180 for 40% off and a pair of sneakers originally priced at $124.99 being discounted 20%. Students used percent proportions to determine discounts and subtract them from the original prices to find the sale price. We extended the idea of using proportions to find percents of numbers (as our AIM suggests) to idea of tips at restaurants, and other services. Students saw that unlike in discounts where we subtract the amount, tips are added to the starting amount.
Part/Whole = %/100, where Whole is the amount of the item(s) and the Part is the portion of the whole (tax, discount, markup, etc).