This document contains notes from a math lesson on the distributive property and order of operations. It includes examples of expanding and factoring expressions using the distributive property. The lesson also reviews order of operations and contains practice problems simplifying expressions using the distributive property and order of operations rules.

1. lesson 21.notebook September 23, 2013
Assignment:
1­­>Set 21 (odds) ­ Due Tomorrow (9/24)
2­­>Test signed??

2. lesson 21.notebook September 23, 2013
Lesson 21 Warm­Up:
1) Simplify: 144
2) Solve by inspection: 8x + 2 = 90
3) How many square YARDS are needed to cover the floor of a
classroom that is 30 FEET long and 30 FEET wide?
4) Julie can read 66 books in one year. At this rate, how many can she
read in 4 months?
5) Name 4 sets of numbers of which zero is a member.

3. lesson 21.notebook September 23, 2013
Lesson 21:
*Distributive Property:
a(b + c) = ab + ac OR a(b – c) = ab – ac
FYI...
­expand­­> 2(a + b) =
­factor­­>2a + 2b =

4. lesson 21.notebook September 23, 2013
More FYI...
ORDER OF OPERATIONS:
­Parentheses (Please)
­Exponents (Excuse)
­Multiply/Divide [left to right] (My Dear)
­Add/Subtract [left to right] (Aunt Sally)

5. lesson 21.notebook September 23, 2013
Examples ­ Lesson 21
Expand:
A) 2(3 + w)
B) 5(x ­ 3)
C) 12(x + y ­ 5)

6. lesson 21.notebook September 23, 2013
Factor:
D) 9x + 6
E) 8w ­ 10
F) 12x + 32y ­ 8

7. lesson 21.notebook September 23, 2013
Simplify:
G) 2 + 5 2 ­ 1
H) (2 + 5) (2 ­ 1)

8. lesson 21.notebook September 23, 2013
I) 4 + (11 ­ 32) 23
J) 10 ­ [8 ­ (6 ­ 3)]
K) 36 + 64
L) |8 ­ 12|