Lesson: Scale Factor
1) A map has a scale of 1 inch = 3 miles. If two cities are 4 ½ inches apart on the map, what is their actual distance from each other?
Direct Instruction: (20 minutes)
Yesterday we solved problems that involved scale. Why do we use scales? What did we need to know in order to solve the problems involving scale?
How do you think we eliminate the units? Let's take a look at how it works.
To find scale factor:
- Convert the scale to the same unit
Guided Practice: (10 minutes)
Find the scale factor for the following scales:
2inches = 15 feet
1 in = 20 yards
0.5 cm = 1.5 m
1 in = 0.5 in
Assessment: (10 minutes)
Scale factor work-out
|scale factor assessment Assessment||