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# Measuring scale on OS Maps

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By the end of the lesson students should be able to:
-measure straight line distances on a map and covert them into ‘real world’ distance
-measure curved distances (roads & rivers) and convert them into ‘real world’ distance

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### Measuring scale on OS Maps

1. 1. Lesson objectives: Knowledge: All will understand what we mean by scale Most will explain how to covert it into real world distance Some will explain the technique to measure a curved line on a map Skills: All will be able measure straight line distances on a map and covert them into ‘real world’ distance Most will be able to measure curved distances (roads & rivers) and convert them into ‘real world’ distance
2. 2. Keywords for today's lesson: Scale Distance Kilometres (KM) Centimetres (CM) Measuring Accuracy
3. 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. 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. 5. 0 1 2 3 4 5 6 Kilometres
6. 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
7. 7. 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
8. 8. 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
9. 9. 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
10. 10. 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?
11. 11. How do we measure something that isn’t straight? Step forward our hero
12. 12. 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’
13. 13. Have we met our lesson objectives? Knowledge: All will understand what we mean by scale Most will explain how to covert it into real world distance Some will explain the technique to measure a curved line on a map Skills: All will be able measure straight line distances on a map and covert them into ‘real world’ distance Most will be able to measure curved distances (roads & rivers) and convert them into ‘real world’ distance