Writing Expressions

Writing Expressions

How can you write an expression that represents an unknown quantity?

You use a $20 bill to buy lunch at a cafe. You order a sandwich from the menu board on page 118.

• Copy and complete the table using information from your book on p. 118:

• In the last column write a numerical expression for the amount of change received.

Open Ended

Write an expression for the amount of change you receive when you order any sandwich from the menu board:

Compare the expression you wrote in part (b) with the expressions in the last column of the table in part (a).

• Part (a) are numerical expressions

• Part (b) are algebraic expressions

Open Ended

The cafe offers several side dishes, each at the same price. You order a chicken salad sandwich and two side dishes. Write an expression for the total amount of money you spend. Explain how you wrote your expression.

The expression 20-4.65s represents the amount of change one customer receives after ordering from the menu board on page 118.

• Explain what each part of the expression represents:

• 20

• 4.65

• s

• Do you know what the customer ordered? Explain your reasoning.

Copy and complete the table here:

Go into the participants tab and give me a coffee mug symbol when you are done.

Then go on to parts b and c.

Poll

What did you think of this format for our lesson today?

• It was great! I liked it better than other zoom lessons we've had.

• I prefer using the zoom whiteboard and just doing practice problems with direct feedback from Miss Caron

• I liked using the google sheet we could interact with the best

• It was okay, but it didn't help me understand the concept better

• It was too slow since I get done with my work quickly

Multiple Choice

Match the phrase with the correct expression:

the product of a number and 3

• $$n\ \div\ 3$$

• $$4p$$

• $$n\ \times\ 3$$

• $$2m$$

• $$3\ \div\ n$$

Multiple Choice

Match the phrase with the correct expression:

the quotient of 3 and a number

• $$n\ \div\ 3$$

• $$4p$$

• $$n\ \times\ 3$$

• $$2m$$

• $$3\ \div\ n$$

Multiple Choice

Match the phrase with the correct expression:

4 times a number

• $$n\ \div\ 3$$

• $$4p$$

• $$n\ \times\ 3$$

• $$2m$$

• $$3\ \div\ n$$

Multiple Choice

Match the phrase with the correct expression:

a number divided by 3

• $$n\ \div\ 3$$

• $$4p$$

• $$n\ \times\ 3$$

• $$2m$$

• $$3\ \div\ n$$

Multiple Choice

Match the phrase with the correct expression:

twice a number

• $$n\ \div\ 3$$

• $$4p$$

• $$n\ \times\ 3$$

• $$2m$$

• $$3\ \div\ n$$

Multiple Choice

Match the phrase with the expression:

4 times a number

• $n\ \div\ 3$
  

• $4p$

• $n\ \times\ 3$

• $2m$

• $3\ \div\ n$