Geography skills

# Scale

Created 3 years ago

Duration 0:06:30
24
A quick tutorial on how scale is used and converted between written, linear and ratio
Slide Content
1. ### Slide 1 - Online presentation

• Geography Skills - SCALE
2. ### Slide 2 - What is Scale?

• 1cm representsâ€¦
• 1/250000
• 1/10
3. ### Slide 3 - A small scale map

• 1cm represents 150km
• As a ratio-
• 150km = 150,000m
• 150,000m = 15,000,000cm
• 1:15,000,000
4. ### Slide 4 - A large scale map

• 1cm represents 20m approx
• As a ratio-
• 20m = 2,000cm
• 1:2,000
5. ### Slide 5 - Quick Quiz

• Which of the following ratios represents the smaller scale map
• 1:10,000
• 1:25
• 1:250,000
• 1:1
6. ### Slide 6 - Interpreting Scale

• Linear
• Words
• Ratio/representative fraction
• As a statement e.g. 1cm represents 1 km.
• As a ruled line (a linear scale)
• e.g.
• 0 1 2 3 4 5km
• or
• as a Representative Fraction (RF) e.g. 1: 100,000
• A scale can be changed from one type of scale to another.
7. ### Slide 7 - Practice conversion

• a) A linear scale shows that 1cm represents 50m. Express as a ratio.
• b) 1cm represents 1km. Express as a ratio.
• c) Ratio 1:250,000. Express in words, simplified.
• d) Ratio 1:50. Express as a representative fraction.
• e) Ratio 1:100. Express as a linear scale.
• 1:5,000
• 1:100,000
• 1cm represents 2.5km
• 1/50
• 0 1 2 3 4 5m
8. ### Slide 8 - Practice conversion

• 1cm represents 500m
• 1cm represents 1km
• 1 cm represents 250m
• 1 cm represents 2.5km