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How to Scale. Why is scaling important? Imagine if you had to draw a full-size map of the United States! – How much paper would it require? – How much.

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Presentation on theme: "How to Scale. Why is scaling important? Imagine if you had to draw a full-size map of the United States! – How much paper would it require? – How much."— Presentation transcript:

1 How to Scale

2 Why is scaling important? Imagine if you had to draw a full-size map of the United States! – How much paper would it require? – How much time would it take? Scaling allows us to take large objects or long distances and shrink them to a smaller size

3 All Maps Include a Scale Bar

4 Scales give you an equivalence factor – Ex: 1 inch = 200 miles – Ex: 1 centimeter = 3 meters

5 Okay, so how do I scale? Figure out what scale you want to use first. – For our notes we will use 1 cm = 5 m, but you will get the chance to make up your own scale later Measure the actual (real) distance Convert the real distance to a scaled distance

6 A Sample Problem In a local park, the swings are 15 meters away from the slide. If I draw a scaled map of the park, how far apart from the swings should I draw the slide? – Step 1: Whats the scale? Lets use 1 cm = 5m – Step 2: Whats the real distance? 15 meters between the swings and the slide

7 – Step 3: Whats the scaled distance? We need to do a conversion 1 cm 5 m = x cm 15 m

8 Cross multiply 1 cm 5 m = x cm 15 m (1) (15) = (5) (x)

9 Solve for x (1) (15) = (5) (x) 55 x = 3 cm You should draw the slide 3 cm away from the swings on your map

10 Practice Main Street at Disneyland is 225 m long. Use the same scale (1 cm = 5 m) to determine how long you should draw Main Street on a map of Disneyland.

11 RoundRobin Begin with partner who has the shiniest shoes. Explain to your partner the steps you followed to solve the problem. Thank your partner. Switch


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