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Main Curriculum Tie:
Background For Teachers:
Ways to Gain/Maintain Attention (Primacy):
Lesson Segment 1: How does the result change when the value of the variable is changed?
Q. What does it man to substitute something? Tell story of making punch and substituting salt for sugar. Q. How would the substitute change the outcome? We can substitute value in algebraic expressions. Let’s do some mental substitution. Read each expression and the value to substitute. Have the students stand as soon as they know the value of the expression after the substitution.
Q. In the mental problems we just did, would the value of the expression have been the same if we had changed the substitute?
Evaluating Expressions Bingo
2m + 3 when:
2(5 – X) when:
Lesson Segment 2: What words indicate operations? How can mathematical symbols represent verbal expressions?
“As I have been writing these algebraic expressions in our Bingo Game for you to copy, I have been saying these expressions with words. We need to be able to read math expressions using words, and we need to be able to write math expressions when we read the words.”
Write the words for and read aloud the math expressions in the Bingo game again, this time read each using a variety of words which indicate the appropriate operation. For example the second expression could be read:
Ask students to write the words and the expression on the back of the Bingo worksheet. Then, have students work together with their team to think of different ways to write and read the expression, 3b.
Do Four-Corners where one person from each team goes to a designated corner to circle up and work with others to generate a list of words that indicate an operation.
Corner 1: person 1, make a list of words that mean “add”.
After five minutes in the corner generating a list of words, each person brings their list back to their team to share the words. Have students list their words on the journal page (attached).
Using the word lists and discussion, help students complete the 12 items below the lists on the journal page.
Lesson Segment 3: Practice using a game
If needed, two players can play against one. Students should write each expression and its matching words from the cards when they get to put them in their “Expert” pile.
Assign any additional practice or application from text as needed.
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