Headline Story
Algebra Machines and Puzzles, #2
Click to enlarge
Introduction
This Headline Story involves several steps. A first approach might be to make it concrete by having students pick a total cost and cost for the apples. Then help students to generalize their procedure.
Headline Story
- Emilio bought oranges, apples, and grapes for a school party.
- The oranges and grapes cost the same amount.
- If you were told the cost of the apples, and the total cost, how could you figure out the cost of oranges?
Possible student responses
The cost of the oranges and the grapes together is the difference between the total cost and the cost of the apples. If the apples cost $3, and the total cost was $15, then the cost of the oranges and the grapes together would be $12. Since the oranges cost the same amount as the grapes, they each must cost $6, or half of $12.
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.