1. please quietly copy in your class journal.
1/21/11 Our Math Goal: to use proportions to compare scale drawings.
Homework: p.331 #6-14
Answer the following multiple choice question taken directly from a HSA test. Show all work:
#1. On a map, ¼ inch represents 50 miles.
How many miles are represented by 1¾ inches on the map?
200 miles
250 miles
300 miles
350 miles

2. What is Scale Factor?
Wow! Look. A Ferrari for $18.99.

3. Brainpop: Scale Drawing

4. Figure out the scale factor3 A B C D E 2 1 2 1 1 6 3 6 2

5. Scaling something to size.
Artists scale drawings all the time.
Draw something creative in the small box.
Hand it over to your partner who will copy your drawing exactly using the scaled up grid onto the larger box.
Measure the height of the original box in cm and the height of the larger box.
What scale factor is used? That is, how much did you multiply the original box to get the larger box?

6. Architecture Job
You and your partner have been hired to do the following:
You need to make a scale drawing of a new building. The work order is as follows:
The building is to be 160 feet long.
The building is to be 120 feet wide.
On the drawing, the scale is to be
½ inch = 20 feet.
Based on the scale, create a drawing of the building.