Scale
Created 2 years ago
Duration 0:06:30
21
A quick tutorial on how scale is used and converted between written, linear and ratio

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Geography skills

Slide 1  Online presentation
 Geography Skills  SCALE

Slide 2  What is Scale?
 1cm representsâ€¦
 1/250000
 1/10

Slide 3  A small scale map
 1cm represents 150km
 As a ratio
 150km = 150,000m
 150,000m = 15,000,000cm
 1:15,000,000

Slide 4  A large scale map
 1cm represents 20m approx
 As a ratio
 20m = 2,000cm
 1:2,000

Slide 5  Quick Quiz
 Which of the following ratios represents the smaller scale map
 1:10,000
 1:25
 1:250,000
 1:1
 Answer: C

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.

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.
 Answers
 1:5,000
 1:100,000
 1cm represents 2.5km
 1/50
 0 1 2 3 4 5m

Slide 8  Practice conversion
 1cm represents 500m
 1cm represents 1km
 1 cm represents 250m
 1 cm represents 2.5km
 Answers
 B & iv
 D & ii
 C & i
 A & iii
 1:250,000
 1:50,000
 1:25,000
 1:100,000
 Match the written scale to the corresponding ratio scale and representative fraction
 1/25000
 1/100000
 1/250000
 1/50000