Keywords for today's lesson:

Scale

Distance

Kilometres (KM)

Centimetres (CM)

Measuring

Accuracy

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

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

0 1 2 3 4 5 6Kilometres

You can measure the

distance with a ruler.

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

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

Convert these scalesScale 2cm = 1 km

1) 2cm

2) 4cm

3) 6cm

4) 7cm

5) 5cm

Scale 4cm = 1 km1) 4cm2) 2cm3) 6cm4) 7cm5) 5cm

Quick recap

AnswersScale 2cm = 1 km1) 1km2) 2km3) 3km4) 3.5km5) 2.5km

Scale 4cm = 1 km1) 1km2) 0.5 km3) 1.5km4) 1.75 km5) 1.25 km

Quick recap

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?

How do we measure something that isn’t straight?

Step forward our hero

ActivityWe 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’