lesson #4 - ratio language & equivalent ratios
TRANSCRIPT
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RATIOS, UNIT RATES &
PROPORTIONSDAY 3Van Siclen Community Middle School
Grade 6 Math
Class 602/603/604/605
Mr. E
September 16, 2014
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TODAYS LESSON LINK!
WWW.TINYURL.COM/VSCMATH3
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DO NOW6 MINUTES
1) Look at the table on the right. Mr. E says
that there are 2 times as many boys asthere are girls. Mr. Campbell says thereare 3 times as many boys as there aregirls. Who is correct? Explain.
Girls Boys T
4 12
5 15
7 21
2) Mr. E wanted to write a ratio of thenumber of TURKISH candies to the
number of Kit Kat candies in the candystore He wrote 2:6 Is he correct? Explain.
3) Use ratio language to describe ratiorelationship between the triangles onthe right.
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TIMES TABLES PRACTICE! (2, 3, 4 & 5
4 x 1 = 4
4 x 2 = 8
4 x 3 = 12
4 x 4 = 16
4 x 5 = 20
4 x 6 = 24
4 x 7
4 x 8
4 x 9
4 x 1
4 x 1
4 x 1
3 x 1 = 3
3 x 2 = 6
3 x 3 = 9
3 x 4 = 12
3 x 5 = 15
3 x 6 = 18
3 x 7 = 21
3 x 8 = 24
3 x 9 = 27
3 x 10 = 30
3 x 11 = 33
3 x 12 = 36
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LESSON OVERVIEW
A _____________ is a comparison between two numbers or thin
Yesterday, we learned about using ratio language to describratios. For example, if we compared the wallpapers in the cla
can say: For every 3 green wallpapers, there are 3 pink wallp
Today we will learn about equivalent ratios.
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Mr. E and Mr. Campbell are usingstring to create a math project. Theratio of the length of Mr. Es string tothe length of Mr. Campbells string is7 to 3. Can you sketch a drawing torepresent this ratio? Can we draw atable to represent this ratio?
If so, how many units draw for Mr. Es part o
How many units shouMr. Campbells part o
We dont know how much each unit of the tapediagram represents. What if each unit represented 1inch. What would be the length of Mr. Es part of the
string? Mr. Campbells?
What is the ratio of the ribbons?
What if each unit represented 2inches. What would be the length
of the ribbons?
What is the ratio of the leMr. Es string to the length
Campbells string now?
Ratios Continued
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= 7:3
2 2 2 2 2 22 = 14:622 2
= ?3 3 3 3 3 3 3 333
What do these 3 ratios have in common?3 minu
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EQUIVALENT RATIOS PART I5 MINUTES
Mr. E and Mr. Campbell createmath problems for VSC Math. Theratio of the number of problems Mr.E creates to the number ofproblems Mr. Campbell creates is 2to 3.
If Mr. E creates 4 problemany problems does Mcreates? Sketch a moddiagram) to show how
List 2 other ratios equivalent to 2:3.
Sketch/model oneof them.
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EQUIVALENT RATIOS PART II5 MINUTES
Mr. E and Mr. Campbell createmath problems for VSC Math. Theratio of the number of problems Mr.E creates to the number ofproblems Mr. Campbell creates is 2to 3.
If Mr. Campbell createproblems, how many pdoes Mr. E create? Ske(tape diagram) to showknow
List 2 other ratios equivalent to 2:3.
Sketch/model oneof them.
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EQUIVALENT RATIOS PART III7 MINUTES John took a long multiple-choice
test at the end of the year. The ratio
of the number of problems John gotincorrect to the number of problemshe got correct is 2:5.
If John got 8 incorrect, questions did he get rig
Use a tape diagram to you found your answer
If he missed 20 questions, how many
did he get right? Can you come up
with another ratio to show the ratio
of how many questions John gotwrong to the number of questions he
got right? How did you find the
numbers?
Can your grou desc
create equivalent ra
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Homework #6Due September 17, 2014 - Proble