TITLE: The Exchange Is Right
SUBJECT: 7th Grade, Algebra (This could be used as part of an interdisciplinary unit on understanding foreign countries.)
TOPIC: Ratios and converting units
INTERACTIVITY: Students will slide sliders to reveal a new price if desired. Then, fill out the corresponding worksheet.
DIRECTIONS FOR USE: You need to purchase each of the four items pictured on the bulletin board (candy bar, diet coke, jeans and sneakers). For each item, you have a different amount of money "in your pocket" under the heading, "amount allotted," either in dollars or pounds. Using the amounts allotted for each item, you must purchase the items according to their posted prices. On the bulletin board, you will see two prices posted: one is visible, while the other is hidden under the slider. Before you purchase the items, you must decide whether you would like to pay the visible price or if you would like to the slide the slider to reveal the hidden price. If you choose to slide the slider, you must pay the revealed price. Then, convert the amount allotted to match the unit of the price (pounds to dollars or dollars to pounds) so that you can purchase the item (round to the nearest cent). After you convert the amount allotted, you will know if you have enough (or not enough, depending on the price you chose) to purchase the item. Finally, if you are able to purchase the item, write the change you have leftover in the appropriate space, rounding to the nearest cent. If you do not have enough to purchase an item, write the amount you would need to do so, again rounding to the nearest cent. You will need to do this entire procedure twice for each item.
TIME: 15 minutes
SPECIAL CONSTRUCTION: Sliders were created from construction paper. They wrap around the stationary information panels (only attached at each end) and are fastened in the back with double sided tape. The sliders are a larger than the info panels to allow for easy sliding.
Maps were hand drawn on construction paper. Each maps mirror image was drawn before they were cut to avoid visible pencil marks.
CREDIT: Extra credit