Evaluate Expressions

Evaluate Expressions

Justify Equivalent Expressions

Opening

Justify Equivalent Expressions

Discuss:

  • How did you know that your expression card was equivalent to your partner’s expression card?
  • A multiplication dot or parentheses can be used to represent multiplication.
  • Explain why these three expressions are equivalent.

Classroom Norms

Opening

Classroom Norms

Classroom norms help us do our best work and meet our learning goals.

Discuss the following with your classmates.

  • What do you need in order to do your best work?
  • What ways can you work with your classmates to make the class an effective group?
  • What norms, or rules, will allow each member of the class the opportunity to grow?

Here are ideas for classroom norms:

  • Ask questions and think creatively.
  • Talk about your ideas and questions with your classmates.
  • Use mathematics vocabulary when you talk or write about math.
  • Make connections between what you know and what you are learning.
  • If you do not know how to solve a problem, write down what you do know.
  • Think about what you are learning from a task, instead of just trying to finish it quickly.
  • Think of a mistake as a chance to learn, not as something to hide.
  • Check your work and think about what caused you to make a mistake. Learn how to correct your work.
  • Work together with your classmates so that everyone learns.

Math Mission

Opening

Detect possible errors while evaluating expressions.

Evaluate Expressions

Work Time

Evaluate Expressions

Read the problem and copy it into your notebook.

Carlos and Martin had different results for the same expression.

  • Do you agree with Carlos or Martin? Explain your reasons using words and a diagram.
  • Add parentheses to Carlos’s and Martin’s work to make both equations true.

     

Challenge Problem

Add parentheses to this expression so that it has a result of 68.

Hint:

  • In what order did Carlos complete the operations to get his result?
  • In what order did Martin complete the operations to get his result?
  • What are the rules for order of operations?

Reflect On Your Work

Work Time

Reflection

Write a reflection about the ideas discussed in class today. Use the sentence starter below if you find it to be helpful.

Parentheses are useful because…