Scale is used on maps to shrink the real world so that it fits on the page. Scale represents how much the mapmaker has reduced the actual distances and sizes. The document teaches how to use different map scales by relating centimeter measurements on the map to equivalent kilometer distances in real life. It also introduces a "magic strip" technique to measure curved or irregular distances on a map using a flexible strip instead of a standard ruler.

2. Keywords for today's lesson:
Scale
Distance
Kilometres (KM)
Centimetres (CM)
Measuring
Accuracy

3. Why do we use scale?
When we make a map … we shrink the real world so that it can
fit on a page
We use scale to do this…
Simply put, scale is how much the person
making the map has shrunk the real world

4. So how does it work?
Simply put, scale is how much the person
making the map has shrunk the real world
1cm on the map 4km in the real world

5. 0 1 2 3 4 5 6
Kilometres
You can measure the
distance with a ruler.

6. 2cm = 1km
You can measure the
distance in cm
Try to be exact!
(Each extra mm = .1)
Then … divide by 2 to
change to km

8. 4cm = 1km
You can measure the
distance in cm
Try to be exact!
(Each extra mm = .1)
Then … divide by 4 to
change to km

11. Convert these scales
Scale 2cm = 1 km
1) 2cm
2) 4cm
3) 6cm
4) 7cm
5) 5cm
Scale 4cm = 1 km
1) 4cm
2) 2cm
3) 6cm
4) 7cm
5) 5cm
Quick recap

12. Answers
Scale 2cm = 1 km
1) 1km
2) 2km
3) 3km
4) 3.5km
5) 2.5km
Scale 4cm = 1 km
1) 1km
2) 0.5 km
3) 1.5km
4) 1.75 km
5) 1.25 km
Quick recap

13. How do we measure something that
isn’t straight?
Things like roads and rivers are bendy, but our ruler is straight…
How can we measure them?

14. How do we measure something that
isn’t straight?
Step forward our hero

15. Activity
We are going to measure the distances between points on your
map using the ‘magic strip’ technique we have just watched
You need:
-Your ruler
-Pencil
-Your ‘Magic strip’