Expressions in Words & Symbols

Expressions in Words & Symbols

Describe the Expression

Opening

Describe the Expression

  • Which of these expressions shows “subtract 3 from x”?

− 3       or       3 – x

Math Mission

Opening

Use words to describe algebraic expressions.

Match Algebraic and Written Expressions

Work Time

Match Algebraic and Written Expressions

Match each algebraic expression card with a written description card.

INTERACTIVE: Matching Algebraic and Written Expressions

Hint:

Replace the words “any number” in the descriptions with the letters in the algebraic expressions.

Prepare a Presentation

Work Time

Prepare a Presentation

Prepare a presentation about the strategy you used to match cards.

Challenge Problem

  • Make up a verbal description of a multi-step calculation that has the words “any number” in it, and then write the algebraic expression for the calculation.

Make Connections

Performance Task

Ways of Thinking: Make Connections

Takes notes about the strategies your classmates used to match algebraic expressions with written expressions.

Hint:

As your classmates present, ask questions such as:

  • What strategy did you use to complete the card sort?
  • Which cards were easiest to match? Which cards were most difficult to match?
  • In the challenge problem, was it difficult for you to write the description first, and then write the algebraic expression? Do you think it would have been easier to write the algebraic expression first?

Algebraic Expressions and Variables

Formative Assessment

Algebraic Expressions and Variables

Read and Discuss

  • In algebraic expressions, letters stand for numbers. You can use any letter to represent an unknown value. A letter used in place of a number in an expression is called a variable.
  • Words can be used to describe algebraic expressions.
  • An algebraic expression combines both numbers and letters using the arithmetic operations of addition (+), subtraction (–), multiplication (⋅), and division (÷) to express a quantity.

Hint:

Can you:

  • Describe how letters are used in algebraic expressions?
  • Describe what elements might be included in an algebraic expression?

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.

Something new I learned today about expressions is …