module 1 lesson 1
TRANSCRIPT
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Homework:Lesson 1 Problem Set
Sept. 10th
Aim: Experience in relationshipsas measuring rate
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How will we measure our rate of passing out papers?
What quantities will we use to describe our rate?
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How Fast is our Class?
Record the results from the paper passing exercise in the table below.
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Key Terms
A RATIO: is an ordered pair of non-negative numbers, which are not both zero.
• A ratio is denoted A:B to indicate the order of the numbers.
• The number A is first the number B is second.
• Two ratio's A:B and C:D are equivalent if there is a number, c, such that C = cA and D = cB
An example of a ratio of two quantities could be the following: 5 miles per 2 hours
We can re-write this ratio as a rate: 2.5 miles per hour
We can re-write this rate as a unit rate: 2.5
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Create a pair of equivalent ratios by making a comparison of quantities discussed in this Example.
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Number of Girls
Number of Boys
Ratio of Girls to
Boys
Class 1 18 11Class 2 14 15Class 3 15 12Class 4 17 11
Class 5 12 18
Whole 7th Grade 76 67
1.) Find in the missing information on the chart.
2.) Are their any equivalent ratios?
3.) Which ratios are larger than the whole grade ratio and which ones are smaller?
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Value-Mart is advertising a Back-to-School sale on pencils. A pack of 30 sells for $7.97 whereas a 12-pack of the same brand cost for $ 4.77. Which is the better buy? How do you know?
Pack of 30 Pack of 12
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In the advertisements from this week, I saw that Best Buy had a deal where you can get 3 DVD‛s for $19.99. Then I saw that I could buy 5 DVD‛s for 35.99 at Walmart. How can I determine which store I should shop at?
What's the Better Buy
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How is finding an associated rate or unit rate helpful when making comparisons between quantities?
Closing
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EXIT TICKET
Watch the video clip of Tillman the English Bulldog, the Guinness World Record holder for Fastest Dog on a Skateboard.
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EXIT TICKET1. At the conclusion of the video, your classmate takes out his or her calculator and says, “Wow that was amazing! That means the dog went about 5 meters in 1 second!” Is your classmate correct, and how do you know?
2. After seeing this video, another dog owner trained his dog, Lightning, to try to break Tillman‛s skateboarding record. Lightning‛s fastest recorded time was on a 75-meter stretch where it took him 15.5 seconds. Based on this data, did Lightning break Tillman‛s record for fastest dog on a skateboard? Explain how you know.
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