Formula Centre
Formula guides and key subject rules for every grade and subject, with worked examples and practice.
Grade 10 Geography essentials
Geography • Essential reference • Grade 10
When to use it
Use when comparing how densely places are populated.
Worked example
20 000 people / 100 km² = 200 people per km².
Common mistakes
- Forgetting the per-square-kilometre unit.
Practice question
Calculate density for 45 000 people in 150 km².
Grade 11 Geography essentials
Geography • Essential reference • Grade 11
When to use it
Use when comparing how densely places are populated.
Worked example
20 000 people / 100 km² = 200 people per km².
Common mistakes
- Forgetting the per-square-kilometre unit.
Practice question
Calculate density for 45 000 people in 150 km².
Grade 12 Geography essentials
Geography • Essential reference • Grade 12
When to use it
Use when comparing how densely places are populated.
Worked example
20 000 people / 100 km² = 200 people per km².
Common mistakes
- Forgetting the per-square-kilometre unit.
Practice question
Calculate density for 45 000 people in 150 km².