Scale Factor Part 2
Presentation
•
Mathematics
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7th Grade
•
Medium
Standards-aligned
Chelsea Moore
Used 21+ times
FREE Resource
31 Slides • 8 Questions
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Scale Factor Part 2
Learning Target: I can find scale factor and missing lengths in word problems using equivalent ratios.
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Conversions = special ratios used to convert between units of measurement
EXAMPLES:
12 inches = 1 foot
8 oz = 1 cup
12 eggs = 1 dozen
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Multiple Choice
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Scale Factor Formula
Sometimes we cannot easily find a missing multiplier
We can use the scale factor formula if we know corresponding sides
Notice the equivalent fractions
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Multiple Choice
Find the scale factor from the big(new) to small shape (original). Remember to simplify your fractions
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Scale Word Problems
Two houses are drawn using the given scale 2 inches = 5 feet
The house drawing is 8.5 inches tall.
How tall is the house?
Remember there are two ways to solve equivalent ratios
Find the Missing Multiplier
OR
Cross multiply/Butterfly Method
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Multiple Choice
A house is drawn 3.5 inches tall. The scale used to draw the house is 1 inch = 20 feet. How tall is the house in feet?
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Conversions = special ratios used to convert between units of measurement
100 centimeters = 1 meter
How many centimeters are in 5 meters?
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Multiple Choice
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Equivalent Ratios: Find the value of x
FInd the scale factor for the denominators then use that to find x
Use cross products to find the value of x
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Multiple Choice
Find the value of the missing number.
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Find the scale factor?
Use the scale factor formula: NEW/original
The new shape is A the original shape is B
Find corresponding side lengths and simplify the fraction
8/12 = 10/15 = 6/9 = 2/3
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Multiple Choice
Find the scale factor from HGI (new) to KJI (original)
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Multiple Choice
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Alex is going to draw an eraser using the scale 1 inch = 2 centimeters. How long will this eraser be?
How many centimeters is this eraser?
Set up fractions: 1 inch/2cm ?/7 cm
Solve for the missing number
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Multiple Choice
Bree is drawing an extra large pencil. Her scale is 2cm = 1 foot. How many feet tall will her pencil be?
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Scale Factor Part 2
Learning Target: I can find scale factor and missing lengths in word problems using equivalent ratios.
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