11/13 Lesson 2.1.5-6 Which is Greater?

1.  Warm-up:  Simplify the following expressions using the Expression Mat.  Record each step using the strategy we practiced yesterday (see below).

a)  4x -(x² + y -4) + x² -3            b)  2y + 4x - 3y - (4 + 2x) - x² + y² + 3

• Strategy:
• Build original expression.  Record original expression
• Move all tiles to "+" region.  Record new expression
• Remove zero pairs. Record simplified expression

2.  Announcements:

• Weekly Privilege Prize
• Unit 3 Project due Tuesday

3.  Homework problem from last night:  3d² - 1, for d = -5

4.  Lesson 2.1.5 and 2.1.6  Which is Greater? (starts on page 65)

• Objective:  I will determine which expression is greater using "legal moves" to simplify expressions.
• Problem 47 as a mini-lesson:  Which is greater?
• Problem 48 in teams. Stoplight!  Do not move ahead
• Discussion:  What are "legal moves?"
• Problems 56 and 57 in teams

5.  Closure:  Problem 57, part b)   Can you tell which expression is greater? Why or why not?

Homework:  Work on your Unit 3 project (details in GC)