say “ ahh-gebra ”
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Say “ Ahh-gebra ”. By Gail Warren and Andy Derer Based on the original by Nancy Hall. Divide your sticks into 3 equal groups. Marking Your Sticks. FIRST group mark THREE RED dots. SECOND group mark FOUR BLUE dots. THIRD group mark FIVE GREEN dots. Questions, Questions, Questions. - PowerPoint PPT PresentationTRANSCRIPT
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Say “Ahh-gebra”By
Gail Warren and Andy Derer
Based on the original by Nancy Hall
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Divide your sticks into 3 equal groups
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Marking Your Sticks
• FIRST group mark THREE RED dots.
• SECOND group mark FOUR BLUE dots.
• THIRD group mark FIVE GREEN dots.
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Questions, Questions, Questions
• What is the largest number you can make with the green sticks?
• What is the largest number you can make with the blue sticks?
• What is the largest number you can make with the red sticks?
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Questions
• 3• 5• 7• 9
• 4• 6• 8• 10
Use your sticks to make the following:
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What is the largest possible number
using all the sticks?
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How much will 3 red sticks equal?
Can we write a math sentence telling how much 3
red sticks equal?
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3 red sticks is 9
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How much will three green sticks equal?
Can we write a math sentence telling us how much 3 green
sticks equals?
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3 green sticks is 15
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What letter could we substitute for red?
r
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We will use b to mean blue.
b
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We will use g to mean green.
g
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There’s a Shortcut!
3 green sticks can be written as 3 x g
And we can get SHORTER!
3 x g can be written as 3g
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3 green sticks is 15A shorter way is
3 x g = 15Even shorter is
3g = 15
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4b1b2b
3bSo what is
equal to?
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A math sentence that contains an equal sign is
called an
EQUATION
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A letter that represents a number is called a
Variable
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What is the variable that stands for 4?
b
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What is the variable that stands for 3?
r
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What is the variable that stands for 5?
g
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Can you figure out this problem using a variable?
is ______.15
And the equation is…
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3g = 15
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It’s time to practice…
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Let’s Wrap Up
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Say “Ahh-gebra”
• What is a math sentence that contains an equals sign called?
• What is a letter that stands for a number called?
Equation
Variable
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Thank you!
Good-Bye