1. Percent Discounts

2. NS 1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interests earned, and tips.
Today’s objective: use our previous topics of decimal multiplication, converting percents to decimals, and percents of numbers to calculate how much items will cost after coupons/sales are applied.
Learning target: Answer at least 3 of the 4 questions correctly on the exit ticket.

3. What is the difference between the savings and the sale price?
The savings is how much less than usual the item costs. This is what we have been calculating so far.
The sale price is how much the item actually costs.

4. How do the savings and the sales price relate?
I have a $3 off coupon for a $12 DVD. How much will it cost?
Original price – savings = sales price
$12 - $3 = $9

5. A $30 toy is on sale for 20% off. How much is the savings?
What is the sale price?
20% = 0.20 = 0.2
$30 × 0.2
$60
$30 - $6 $24
= $6.00 = $6 .

6. A shirt normally costs $20 but I have a 14% off coupon
A shirt normally costs $20 but I have a 14% off coupon. How much money will I save?
14% = 0.14
$20 ×.14
$280 .

7. What is the sale price?
$20 - $2.80
When subtracting decimals, line up the decimal points vertically.
$20 = $20.00
$ $2.80
$17.20

8. Direct Station
We will work together on word problems that involve finding percents of numbers.

9. Collaborative Station
You and your partner are shopping for various items. Of course, you want to find the cheapest prices, but it’s hard to tell because all the stores are having sales and coupons.
For each item, you and your partner(s) will each calculate how much the item costs at a different sore.

10. Collaborative Station
Set up your paper like this:
For each item, you and your partner(s) will each calculate how much the item costs at a different sore.
Item
Original Price
Savings (show work)
Sale Price (show work)
Cheapest Store?
Item
Store A
Store B
Store C
Computer
$800, 20% off sale
$900, 25% off coupon
$1000, 30% off sale

11. Collaborative Station Example
Store A sells printers for $30 and they have a 25% off sale.
Item
Original Price
Savings (show work)
Sale Price (show work)
Cheapest Store?
Printer
$30
25% = 0.25
.25
× $30 $7.50
$ $ $22.50
(Write Store A/B/or C here)

12. Independent Station
Continue working on ST Math’s multiplying decimals unit. As you saw, correctly multiplying decimals is a key part of finding the percent of a number!
Write down the multiplication calculations on your work paper.