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Choropleth Maps

HigherHigher tier onlyAQAEdexcel

Practise Choropleth Maps for GCSE Statistics with this free worksheet and full mark scheme — Higher tier exam-style questions with worked answers for AQA and Edexcel. Choropleth maps use shading of increasing intensity to show how a value varies across areas of a map.

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These worksheets and mark schemes are original, written for Virtus Academy and checked against the current AQA and Edexcel specifications. Every worksheet comes with a full mark scheme.

This is a Higher tier only topic, so there's no Foundation paper — only the Higher worksheet and mark scheme below.

Higher

WorksheetHigher · PDFMark SchemeHigher · PDF

Topic overview

A choropleth map uses shading to show how a quantity varies across geographical areas. This is a Higher-only topic.

Darker shading normally represents higher values and lighter shading lower values. A key is essential, showing which shade corresponds to which range of values.

The main limitation is that each area is shown as uniform, when in reality the quantity varies within it. A region shaded for high population density may contain both a city and empty countryside. Large areas also draw the eye more than small ones, so a large sparsely populated region can appear more significant than a small densely populated one.

Revision notes

How it works

Geographical areas are shaded according to the value of a quantity in each.

Darker shading normally represents higher values. A key must show which shade corresponds to which range. Ranges should not overlap.

The uniformity limitation

Each area is shown as a single uniform shade, hiding all variation within it.

A region shaded for high population density may contain a dense city and empty countryside. The map cannot show this, which can be misleading.

The area limitation

Large areas occupy more of the map and draw the eye more than small ones.

A large, sparsely populated region can therefore look more significant than a small, densely populated one, even when the small one contains far more people.

Key points

  • Choropleth maps use shading for values.
  • Darker shading normally means higher values.
  • A key showing shade ranges is essential.
  • Each area appears uniform.
  • Variation within an area is hidden.
  • Large areas draw the eye disproportionately.

Worked examples

Example 1

State what a darker shade normally represents on a choropleth map. [1 mark]

Working

A higher value of the quantity being shownstate the convention

Example 2

Explain one limitation of a choropleth map. [2 marks]

Working

Each area is shaded uniformly, so variation within that area is hiddenstate the limitation
meaning a region may contain very different values that the map cannot showexplain the consequence

Example 3

Explain why a large sparsely populated region may be misleading on a choropleth map. [2 marks]

Working

The large area occupies much of the map and draws the eyestate the visual effect
so it appears more significant than a small densely populated region containing far more peopleexplain why it misleads

Common mistakes

  • Omitting the key.

    Without it the shading cannot be interpreted.

  • Using overlapping ranges in the key.

    Each value must fall into exactly one shade band.

  • Assuming an area is uniform.

    The map hides all variation within each region.

  • Judging significance by area.

    Area on the map reflects geography, not the quantity shown.

Exam tips

  • Always include a key with non-overlapping ranges.
  • Learn both limitations — uniformity and area.
  • Use darker shading for higher values.
  • Remember this is a Higher-only topic.

Key terms

Choropleth map
A map using shading to show values across areas.
Key
A guide showing which shade means which range.
Uniform
Shown as a single value throughout an area.
Density
A quantity per unit area, often shown on choropleth maps.

Related topics

Written and reviewed against the current AQA and Edexcel specifications. Spotted an error? Let us know.