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Shopping Spree

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									Shopping Spree (modified) – Teacher’s notes
Objectives: Students will be able to use number and fraction models to develop
an understanding of discount and sales price.

Vocabulary: (Discussing vocabulary beforehand helps students with this activity.)
    Original price
    Discount
    Sale price

TAKS/TEKS: TAKS Obj.1, TEKS 6.1B, 7.5A, 8.3B

Materials:
   Extra strips of paper for modeling, if needed

Teacher notes
    Vocabulary discussion should occur first.

      Model what is expected of the students by folding paper, labeling the
       parts and cutting off the discount to visually show the first problem. Talk to
       students about how the original price, discount, and sales price is
       represented with the paper parts.

      Modeling a problem on the bars helps the students know what to do.

      Students should work the problems using the paper bars and then
       complete the follow-up questions.

      Discussion can be based on these questions.
 Shopping Spree                                              Name________________________

1. You are going to buy a new CD player. When you get to the store, they are
   having a sale where you scratch-off a card to determine your discount rate.
   Determine the discount and sale price for each discount rate if the original price
   was $60.

   a. If the discount is ½ off:

              Discount                                   Sale Price

   0                              $60        0                            $60




   0              ½                          0               ½


   Discount amount: $__________ Sale Price: $________________

   Equation _________________________________________________


   b. If the discount is ¼ off:

              Discount                                   Sale Price

   0                              $60        0                            $60




   0      ¼       ½          ¾               0
                                                     ¼        ½       ¾


   Discount amount: $__________ Sale Price: $________________

   Equation ________________________________________________



   c. If the discount is ⅓ off:

              Discount                                   Sale Price
                                         ¼
   0                               $60           0                              $60



   0          ⅓          ⅔                               ⅓            ⅔

                                                     ¼




   Discount amount: $__________ Sale Price: $________________
     Equation ________________________________________________

2. You are going shopping and can afford to spend $240. The store is having a sale
   where you scratch-off a card to determine your discount rate. Determine the
   original price for each discount rate if the sale price is $240. Disregard tax.

   Use the bars to find the original price given the sale price of $240.

                   0              240             $______


        a.
                   0               ½                  1




                 Discount: ½ off                  Original price: $_____________


                   0                      240     $______


        b.
                   0
                          ¼        ½          ¾       1




                 Discount: ¼ off                  Original price: $_____________

                   0                    240       $______

        c.
                   0          ⅓          ⅔            1



                 Discount: ⅓ off                  Original price: $_____________



   Now try the same idea with percents, instead of fractions.

3. A DVD player that costs $300 is offered at 50% off. What is the discount and sale
   price?
4. A TV/VCR combo that costs $600 is offered at 33.3% off. What is the discount
   and sale price?




5. The discounted price of a CD player is $125. The discounted price is 50% off the
   original price. What was the original price?
6. The discounted price of a video game is $50. The discounted price is ⅓ off the
   original price. What was the original price?




7. What is a discount? (Explain in complete sentences)




8. What is a sales price? (Explain in complete sentences)

								
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