3.1c Class Activity: Algebraic Expressions Write two numeric expressions for the context below: different Maria bought 5 apples for $0.35 each. How would the expression change if she spent $0.40 on each apple? What if you how much each apple cost, how could you write an expression? didn’t know For each context, four algebraic expressions are offered. Make a conjecture about the correctness of the expression. Then, evaluate it for the given value, and explain why the expression did or work for the didn’t given context. Ryan bought 3 CDs for dollars each and a DVD for $15. Write an expression of how much money Ryan x spent. Correct Did it Evaluate Expression Why or why not? expression? = 7 work? x a. 3 + + 15 x b. 15x + 3 c. 15 + x + x + x d. 3x + 15 I started with 12 jellybeans. Sam ate 3 jellybeans and then Cyle ate jellybeans. Write an expression for y how many jellybeans were left. Correct Did it Evaluate Expression Why or why not? expression? = 6 work? y a. 12 3 y – – b. 12 (3 y) – –
3.1c Class Activity: Algebraic Expressions Write two different numeric expressions for the context below: Maria bought 5 apples for $0.35 each. How would the expression change if she spent $0.40 on each apple? What if you didn’t know how much each apple cost, how could you write an expression? For each context, four algebraic expressions are offered. Make a conjecture about the correctness of the expression. Then, evaluate it for the given value, and explain why the expression did or didn’t work for the given context. Ryan bought 3 CDs for x dollars each and a DVD for $15. Write an expression of how much money Ryan spent. Expression Correct expression? Evaluate x = 7 Did it work? Why or why not? a. 3 + x + 15 b. 15x + 3 c. 15 + x + x + x d. 3x + 15 I started with 12 jellybeans. Sam ate 3 jellybeans and then Cyle ate y jellybeans. Write an expression for how many jellybeans were left. Expression Correct expression? Evaluate y = 6 Did it work? Why or why not? a. 12 – 3 – y b. 12 – (3 – y)
7-3-Student%20Workbook.docx