You will learn
- Define population distribution, density, census.
- Calculate density.
- Explain physical and human factors.
- Use Sierra Leone and world examples.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- People are spread unevenly.
- Density is population divided by area.
- Physical and human factors shape where people live.
- Censuses count populations.
Words to know
the average number of people living in one square kilometre
an official count of a population
having many people in a small area
having few people in a large area
1. Discover: Counting heads, counting hills
Mr Cole draws two made-up districts. District A has 60,000 people in 20 square kilometres. District B has 60,000 people in 600 square kilometres. “The same number of people, but different densities,” he says. “60,000 divided by 20 is 3,000 people per square kilometre; 60,000 divided by 600 is 100.” He explains that people often live where there is water, fertile land, work and safe transport. Sierra Leone has about 8 million people and about 110 people per square kilometre, with more people near Freetown and major towns than in remote areas.
Think: Why might more people live near a river or a port?
2. Understand: Population distribution
Idea 1: Density
Population distribution shows where people live. Population density is population divided by area, usually people per square kilometre. A census is an official count. World population is about 8 billion, but people are spread unevenly: some areas are densely populated and others sparsely populated.
Idea 2: Physical factors
Physical factors include water supply, fertile soil, a gentle climate, flat land and access to the coast or rivers. Steep mountains, deserts, dense forests and very cold or very dry places tend to have fewer people. In Sierra Leone, coasts and river lowlands often have more settlement than remote hills.
Idea 3: Human factors
Human factors include jobs, schools, health services, markets, transport, safety and history. Cities often grow where roads, ports and services come together. Settlement patterns can be scattered, in lines along roads or rivers, or in clusters.
3. Worked examples
Example 1 (I show you): Define
Population density.
- Think.
- Say.
- Check.
Answer: People per square kilometre.
Example 2 (We do it together): Calculate
Density: 5,000 people in 50 km².
- Think.
- Divide.
- Check.
Answer: 100 people per km².
Example 3 (You try): Name
A physical factor.
Show the steps and answer
- Think.
- Say.
- Check.
Answer: Fertile soil.
Did you know?
More than half of the world’s people now live in cities, a change that happened around 2007.
Why this matters
Knowing where people live helps governments plan schools, clinics and roads.
4. Explore: Density detectives
Use a table of five made-up districts with populations and areas. Calculate each density, rank the districts from most to least dense, and suggest one physical and one human reason for the pattern.
- Read.
- Calculate.
- Rank.
- Explain.
Think about it: what did you notice?
What did you notice? Density tells a different story from total population.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- Population density is ___.
- A census is ___.
- Densely populated means ___.
- Sparsely populated means ___.
Guided practice
Question 1. What is density?
People per area.
Question 2. What is a census?
Official count.
Question 3. What is dense?
Many people.
Independent practice
Level 1: Start
- What is density?
- What is a census?
- What is dense?
- What is sparse?
- Name a factor.
Level 2: Grow
- Why uneven?
- Why censuses?
- Why ports?
Level 3: Stretch
- Read the table.
- Calculate density.
- Rank.
Answers are in the answer key below. Try first, then check.
6. Apply: Social Studies in everyday life
Explain two factors that influence where people live.
Show a sample answer
Water and jobs.
Another one. Ask an adult why people settled near a certain place, in general terms.
Show a sample answer
Share.
7. Common mistakes
Fix: Density depends on area.
Fix: Distribution is uneven.
8. Lesson summary and revision card
- I can define population distribution, density, census.
- I can calculate density.
- I can explain physical and human factors.
- I can use Sierra Leone and world examples.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- People are spread unevenly.
- Density is population divided by area.
- Physical and human factors shape where people live.
- Censuses count populations.
11. Next lesson
Next lesson: Population change. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define population density and census. [2 marks]
- Calculate density for 3,000 people in 30 km². [3 marks]
- Explain two factors affecting distribution. [3 marks]
- Explain why density is more useful than total population for planning. [2 marks]
Total: 10 marks.
Marking guide and model answers
- Density [1]; census [1]
- Method [1]; 100 [1]; units [1]
- Factor 1 [1]; factor 2 [1]; link [1]
- Reason [1]; example [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is density?
- What is a census?
- What is dense?
- What is sparse?
- Name a factor.
- Why uneven?
- Why censuses?
- Why ports?
- Read the table.
- Calculate density.
Homework
Draw a density map.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is density? | People per area. | 1 |
| 2. What is a census? | Official count. | 1 |
| 3. What is dense? | Many people. | 1 |
| 4. What is sparse? | Few people. | 1 |
| 5. Name a factor. | Water. | 1 |
| 6. Why uneven? | Resources differ. | 1 |
| 7. Why censuses? | Plan services. | 1 |
| 8. Why ports? | Trade. | 1 |
| 9. Read the table. | Read. | 1 |
| 10. Calculate density. | Calculate. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 People per area.; 2 Official count.; 3 Many people.; 4 Few people.; 5 Water.. Level 2: 1 Resources differ.; 2 Plan services.; 3 Trade.. Level 3: 1 Read.; 2 Calculate.; 3 Rank..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Define population distribution, density, census | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Calculate density | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Explain physical and human factors | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Use Sierra Leone and world examples | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “The biggest population is always the densest.” Density depends on area.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Make a density chart.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child calculates population density using made-up districts. Please help with division practice. You do not need to be an expert to help.
- Practise division.
- Look at a map.
- Avoid comparing groups.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: define population distribution, density, census; calculate density; explain physical and human factors; use Sierra Leone and world examples.
Prerequisite knowledge. Grade 6 ideas: population distribution maps, migration across history, trade routes and Africa’s regions.
Materials. Table, calculators. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Prepare tables.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Tell the counting heads story.
Explanation (10 min). Teach distribution.
Guided activity (10 min). Density detectives.
Independent activity (10 min). Discuss.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Where do people live and why?
Teacher explanation notes. Start with a picture, story, map or local example. Then talk about what was seen, then draw and write. Always ask “how do you know?” and invite more than one view. Treat every family, culture and community with respect, and never ask learners to share private information.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use pictures, maps, real objects and short sentences, and let learners work with a partner. Let learners point, show, act or draw instead of writing. Extension. Ask learners to find a new example from their own community and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “The biggest population is always the densest.” Density depends on area.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Make a density chart. Enrichment. Find one new example near your home or school, draw or write about it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: NCSS standards and C3 Framework, Cambridge Primary Humanities and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Social Studies curriculum, Grade 6 Unit 8, topic 1; NCSS C3 Framework, human population, movement and cultural patterns; Cambridge Lower Secondary Humanities, population and migration; IB Primary Years Programme, where we are in place and time. These sources informed the lesson.