Ratios and Percents RP. 3..

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Presentation transcript:

Ratios and Percents RP. 3.

DO NOW Plickers

Standard 7.RP.3 Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commission, fees, percent increase and decrease, percent error.

Teaching Point Students

VIDEO

Discounts

Step by Step-Finding Sale Price Step 1: Multiply the regular price by the discount percent(written as a decimal). You find the DISCOUNT Step 2: Subtract the Discount from the regular price. You find the sale price SALE PRICE

Example #1 A shirt is regularly priced at $36.00 It is on sale at 25% off. What is the sale price?

A shirt is regularly priced at $36. 00 It is on sale at 25% off A shirt is regularly priced at $36.00 It is on sale at 25% off. What is the sale price? Step 1: Multiply the regular price by the discount percent. (36)(25%.25) = 9 Step 2: Subtract the Discount from the regular price. You find the sale price 36 – 9 = 27 The sale price is $27

Example #2 Find the sale price The regular price of a suit is $150.00. It is discounted 10%

The regular price of a suit is $150. 00. It is discounted 10% The regular price of a suit is $150.00. It is discounted 10%. Find the sale price ? Step 1: Multiply the regular price by the discount percent. (150)(10%.10) = 15 Step 2: Subtract the Discount from the regular price. You find the sale price 150 – 15 = 135 The sale price is $135

Your Turn Find the Sale Price: Sneakers selling at $45.00, on sale at 25% off. Sweaters selling regularly at $50.00 discounted 50%. Sunglasses selling at 29.95, on sale at 15% CD’s selling regularly at $14.95 on sale at 10% off.

Another Way Step 1: Subtract the percentage of the discount from 100 Step 2: Multiply that number(as a decimal) by the regular price – SALE PRICE

Example #1 A shirt is regularly priced at $36.00 It is on sale at 25% off. What is the sale price?

A shirt is regularly priced at $36. 00 It is on sale at 25% off A shirt is regularly priced at $36.00 It is on sale at 25% off. What is the sale price? Step 1: Subtract the percentage of the discount from 100 100%-25% = 75% Step 2: Multiply that number(in decimal) by the regular price – SALE PRICE (75%.75)(36) = $27.00 The sale price is $27

The regular price of a suit is $150. 00. It is discounted 10% The regular price of a suit is $150.00. It is discounted 10%. Find the sale price Step 1: Subtract the percentage of the discount from 100 100%-10% = 90% Step 2: Multiply that number(in decimal) by the regular price – SALE PRICE (90%.90)(150) = $135.00 The sale price is $135

Let’s Play A Game Each group must write down the answer to the question First group to do it wins points for that questions