Warning! JavaScript must be enabled for proper operation of the site.

Dueling Discounts

by Dan Meyer

34
skips
66
questions
Dueling Discounts

Act One

  • Dan Meyer

    Dan Meyer

    February 27, 2013

    Which coupon should I use?

  • Teacher note
    Make sure students write down their ideas on their own, then share them with their classmates, and then share them out with the class. The worst case scenario is for one student to yell out, "It depends," at which point no one else thinks about the problem.
  • Teacher note
    Also: take a vote. Tally their responses.

Act Two

  • Teacher note
    Either print out the following images for each student or put them at different stations. Students should calculate which coupon is the best deal for each.
  • ImageDesk
  • 1.

    Which coupon would be best to use for the desk?

  • ImageAvenger's Playset
  • 2.

    Which coupon would be best to use for the Avenger's Playset?

  • ImageBatmobile
  • 3.

    Which coupon would be best to use for the Batmobile?

  • ImageCD player
  • 4.

    Which coupon would be best to use for the CD Player?

  • ImageChair
  • 5.

    Which coupon would be best to use for the chair?

  • ImageConverse shoes
  • 6.

    Which coupon would be best to use for the Converse shoes?

  • ImageNightstand
  • 7.

    Which coupon would be best to use for the nightstand?

  • ImageCoffee percolator
  • 8.

    Which coupon would be best to use for the coffee percolator?

  • ImageWidescreen TV
  • 9.

    Which coupon would be best to use for the widescreen TV?

  • 10.

    This is exhausting. Can you come up with a rule that would help us decide under what circumstances we should use one coupon or the other?

  • Teacher note
    Really play up how exhausting it is to run the same calculation every time. Mathematicians like think smarter, not harder.

Sequel

  • 11.

    What if you were holding two coupons, one that said, "$x off" and the other said, "x%" off. Which do you use and when?

show 66 more questions

Comments

Join or sign in to leave a comment.