8/11/11 ©evergreen public schools 2010 1 the other vancouver teacher notes supplies note paper and...
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8/11/11
©Evergreen Public Schools 2010
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The Other VancouverTeacher Notes
Suppliesnote paper and calculator
Vocabularyformula
• This lesson is intended to have students see a purpose for rewriting formulas.
• They convert one way, like Celsius to Fahrenheit.• Then they need to rewrite to convert the other way so they don’t have to
keep solving equations.
NOTE: this lesson is very long. Consider finishing the slide show on the second day.
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Rewriting Equations & Formulas
The Other Vancouver
You need paper, pencil and a calculator.
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Practice 4. Model with mathematics.
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A.CED I can create equations that describe numbers or relationships.
A.CED.4
What is the inverse of multiplication?
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There is another
Vancouver.
Do you know where it is?
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What is the temperature in the other Vancouver?
What is the temperature in the other Vancouver?
• Let’s find out.• Look in the upper left corner of their
online newspaper.• Is it cold, hot or nice?
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What is the temperature in the other Vancouver?
What is the temperature in the other Vancouver?
• It may look cold, but notice how the temperature is measured.
• This equation is used to convert temperature in Celsius to Fahrenheit.
• Find the current temperature for the other Vancouver in Fahrenheit.
• Is it cold, hot or nice?
932
5F C
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What is the temperature in the other Vancouver?
What is the temperature in the other Vancouver?
• Write down the predicted high and low temperatures for today and the all time
record high and low temperatures for today.
newspaper• Use the equation to convert these
temperatures from Celsius to Fahrenheit.
• Record the data in a table.
932
5F C
°F °C
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Canadians go south.• If Canadians go south for the winter what
would they think of our temperatures in, our newspaper?
• Be prepared to copy down the predicted high and low temperature for today and tomorrow in our Vancouver.
The Columbian
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Canadians go south.The Columbian
• Convert the high and low temperatures for the next two days from Fahrenheit to Celsius.
• Add this data to your table.
• Is the formula harder to use for us or the Canadians?
932
5F C °F °C
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Find current Write a Celsius temperature conversion
___ 9
5C 32
32 32
___ 9
5C
5 ___ 9
5C
5
___ 9C
___
9C
F 9
5C 32
32 32
F 329
5C
5 F 32 9
5C
5
5 F 32 9C
5 F 32 9
C
What do you notice about both solutions?
What do you notice about both solutions?
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The Columbian• The inverse of the Fahrenheit function to
convert the high and low temperatures for the next two days from Fahrenheit to Celsius.
• How does using this formula compare to the other?
Canadians go south.
°F °C
C 5 F 32
9
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Perimeters of RectanglesPerimeters of Rectangles
What is the formula for the perimeter of a rectangle?
P = 2L + 2WComplete the table.
Perimeter
Length
Width
3 4
5 7
10 9
6 6
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Perimeters of RectanglesPerimeters of Rectangles
Find the inverse of the the function P = 2L + 2W to write a conversion you can use to complete the table.
Perimeter
Length
Width
12 4
18 5
26 10
19 7
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Areas of TrianglesAreas of Triangles
What is the formula for the area of a triangle?
Complete the table. Area Base Height
3 4
5 7
10 9
6 6
A bh
2
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Areas of TrianglesAreas of Triangles
Find the inverse of the the function to write a conversion you can use to complete the table.
Perimeter
Length
Width
12 4
18 5
26 10
19 7
A bh
2
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Team PracticeTeam Practice
1. Solve for w: V = l w h2. Solve for a: v = 4 + at3. Challenge: Sam says that the following
equations are two ways to write the SAME formula. Decide whether or not you agree with Sam. Explain how you made your decision.
s
n
n 1 n
s
s 1
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DebriefDebrief
Why could it be helpful to rewrite a formula by solving for a different variable?
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5
3
12
4
Did you hit the target?A.CED I can create
equations that describe numbers or relationships.
Rate your understanding of the target from 1 to 5.
5 is a bullseye!
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PracticePractice
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Ticket Out
Solve for x.
3x + 6 = 24
3x + 4y = 24
How are the processes the same?
How are they different?
How are the processes the same?
How are they different?