GRADE 7 MATHEMATICS (7.2) Number, operation, and quantitative reasoning. The student adds, subtracts, multiplies, or divides to solve problems and justify solutions. The student is expected to: (G) determine the reasonableness of a solution to a problem.
Sammy bought 6 different compact discs. The prices ranged from $12.80 to $19.50 per compact disc. He bought at least one at the least price and at least one at the greatest price. List four possible total costs of the compact discs, not including tax. Your list needs to include a least possible and greatest possible total cost.
Write a range for the total cost of the 6 discs.
1. What mathematical concepts and vocabulary do I need to know to be able to work this problem?
2. Will the Grade 7 Mathematics Formula Chart be helpful on this problem? Why or why not?
3. Will a picture or diagram be helpful on this problem? If so, how?
4. How would I decide if a given total cost for this problem was reasonable or not?
5. What problem-solving strategy or strategies will I use to help solve this problem?
6. Extension (7.2F): Choose one of your possible costs above and find an average cost per compact disc.
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