This document contains notes from a math lesson on scale factors and proportional relationships. It includes examples of calculating scale factors based on measurements of original objects and scale drawings. Homework assigned includes completing problem sets, a CRS assignment, and preparing for a quiz. The lesson objectives are on using unit rates as scale factors and how scale factors are used to determine if drawings are proportional reductions or enlargements of actual objects.

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Homework: 1.) Lesson 17 Problem Set #2, 4, and 6
2.) CRS #4 due tomorrow
3.) Module 1 Quiz 2 Monday 10/19
Objective #17: The Unit Rate as the Scale Factor
Tuesday, October 13, 2015
Exit Ticket from Lesson 16
IT IS TWO PAGES
DO NOW:

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Check HW Answers: Page S.69
Page S.70

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Check HW Answers: Page S.71

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Page S.72

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They are proportional.
Yes.
The unit rate is the same for all measurements.
constant of proportionality.

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Scale Factor:
scale factor =
actual object
drawing
calculated by determining the constant of
proportionality (or unit rate) between the scale
drawing and the actual picture.

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Scale Factors greater than 1,
reduce or enlarge the segment?
Scale Factors less than 1,
reduce or enlarge the segment?

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What is the scale factor?

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Page S.74
Original
Measurements
Scale Drawing
Measurements
1

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Now use a scale factor of 1/2.
What will the dimensions be?
Original
Measurements
Scale Drawing
Measurements
1

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5ft

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Closing

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Homework: Problem Set 17
Add the following information.
Sketch a scale drawing.
8in 10in
6in

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