1. Scale Factor

2. Organizer What is it?Find a Scale Factor #1 RuleReal Word Problem Scale Factor

3. 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.

4. 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

5. Example Model SizeActual Size Size1 ft long80 ft long A Model Airplane vs Real Airplane

6. Example Blueprint Size Actual Size Size2.5 ft long145 ft long Blueprint of House vs Actual House

7. Example Map SizeActual Size Size2.3 ft long 15206400 ft long Map of U.S.A. vs Actual U.S.A.

8. Example Toy SizeActual Size Size0.9 ft long151 ft long Toy Statue of Liberty vs Actual Statue

9. 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

10. Example

11. 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?

12. Example On a scale drawing, a helicopter is 2.2 ft long. The scale factor is 1/9. Find the length of the helicopter.

13. MAP ACTIVITY