Scale

A quick tutorial on how scale is used and converted between written, linear and ratio

Geography skills
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Scale

Created 3 years ago

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A quick tutorial on how scale is used and converted between written, linear and ratio
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Slide Content
  1. Online presentation

    Slide 1 - Online presentation

    • Geography Skills - SCALE
  2. What is Scale?

    Slide 2 - What is Scale?

    • 1cm represents…
    • 1/250000
    • 1/10
  3. A small scale map

    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. A large scale map

    Slide 4 - A large scale map

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

    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
  6. Interpreting Scale

    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. Practice conversion

    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
  8. Practice conversion

    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