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Published byNeil Oliver Modified over 9 years ago
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Scale Factor
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Organizer What is it?Find a Scale Factor #1 RuleReal Word Problem Scale Factor
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What is it? Scale Factor is the number you multiply to enlarge or reduce shapes or ratios. Example: Make something TWICE AS BIG has a scale factor of 2 because you multiplied by 2.
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How to Find the Scale Factor In Math, Divide the larger number by the smaller number. In Real World, look for a KEY, SCALE, or LEGEND. It will tell you the scale factor
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Example Model SizeActual Size Size1 ft long80 ft long A Model Airplane vs Real Airplane
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Example Blueprint Size Actual Size Size2.5 ft long145 ft long Blueprint of House vs Actual House
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Example Map SizeActual Size Size2.3 ft long 15206400 ft long Map of U.S.A. vs Actual U.S.A.
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Example Toy SizeActual Size Size0.9 ft long151 ft long Toy Statue of Liberty vs Actual Statue
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Real World Problem Create a Proportion. Fraction 1 = Fraction 2 Fraction 1 = the scale factor as a fraction Fraction 2 = size of model Actual size Solve for x. One of those will be an x
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Example
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The scale on a road map is 1 cm = 500 miles. If the distance on the map between New York City and Memphis is 2.2 cm, what is the actual distance between the two cities?
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Example On a scale drawing, a helicopter is 2.2 ft long. The scale factor is 1/9. Find the length of the helicopter.
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MAP ACTIVITY
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