Lesson Plan Proportions

1
(No Transcript)
2
Lesson PlanProportions

• Objective(s)
• Determine whether two ratios form a proportion.
• Solve proportions.
• Standard
• EA-2.5 Carry out a procedure using the properties
  of real numbers (including commutative,
  associative, and distributive) to simplify
  expressions.
• EA-3.8 Apply proportional reasoning to solve
  problems.
• Relevance
• Proportions can be used to find percents of
  increase and decrease
• Agenda
• Starter Assignment, HW CR, Review, Solving
  Proportions, Solving Multi-Step Equations Board
  Practice, HW

3
Starter AssignmentSeptember 9, 2008

• Solve each equation for the variable.
• 5x 3 13 3x
• 9(4b 1) 2(9b 3)
• 2(w 3) 5 3(w 1)

4
5x 3 13 3x
5
9(4b 1) 2(9b 3)
6
2(w 3) 5 3(w 1)
7
Homework Check and Review

• Practice Workbook
• Page 21
• Lesson 3-5
• (1 12 and 21 and 22 ALL)

8
5x 3 13 3x
9
-4c 11 4c 21
10
1 s 6 6s
11
14 5n -4n 17
12
½ k 3 2 ¾ k
13
½ (6 z) z
14
3(-2 3x) -9x - 4
15
4(4 w) 3(2w 2)
16
9(4b 1) 2(9b 3)
17
10(6 5y 2(-5 4y)
18
6 2(3j 2) 4(1 j)
19
-5x 10 2 (x 4)
20
21. 3(d 8) 5 9(d 2) 1
21
22. 2(a 8) 7 5(a 2) 3a 19
22
Solving Proportions
23
Means-Extremes Property

• To solve a proportion, you cross multiply, which
  is known as setting the means extremes.
• Example

24
Example
25
Example
26
Solve the proportion
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)
32
Dry Erase BoardPractice
33
(No Transcript)
34
Tonights HomeworkSeptember 9, 2008

• Practice Workbook
• Page 22
• Lesson 3-6
• (1 33 Odd)