Lesson 3 1 2 Teacher Notes Standard Preparation

Lesson 3. 1. 2 – Teacher Notes Standard: Preparation for 7. NS. 1 c Understanding subtraction of rational numbers. • Full mastery by end of chapter Lesson Focus: Focus is additional practice of order of operations. (3 -15) • I can subtract numbers (i. e. fractions, decimals, integers, etc. ) • I can demonstrate the subtraction of rational number as applying the additive inverse. Calculator: Yes Literacy/Teaching Strategy: I Spy/Huddle (3 -12, 3 -13); Swapmeet (3 -14)

Bell Work

In today’s lesson, you will continue to simplify expressions using the correct order of operations. You will also learn how to identify terms in expressions that are more complicated.

3 -12. For each of the following expressions: Simplify the expression (circle your terms!) a. − 3 + 4(− 2)3 + 5 b. − 32 + 4(− 2 + 5)

3 -13. Katrina and Madeline were working on problem 3‑ 12 when Madeline noticed, “These two expressions look almost the same, except that one has two terms, while the other has three!” Discuss Madeline’s observation with your team. Explain which expression has two terms and which has three. Terms in expressions are separated by addition (+) and subtraction (–) signs unless the sum or difference is inside parentheses.

3 -14. Consider the expression 3(5 + 2 · 4) + 2(− 3). a. Work with your team to draw a diagram representing this expression. Your diagram could show Cecil’s movements, for example, or it could show + and – tiles that could be represented by this expression. b. Simplify the expression. c. Discuss with your team how you might circle terms in this expression. Be ready to explain your ideas to the class.

Practice •