You will learn
- Define variable.
- Name independent and dependent.
- List controlled variables.
- Spot them in an experiment.
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
- We change one variable at a time.
- We measure the dependent variable.
- We keep other variables controlled.
- Naming variables makes tests clear.
Words to know
anything that can change in a test
the one thing we change
the thing we measure
a thing we keep the same
1. Discover: The bouncing balls
Nana tests which ball bounces highest. She drops each ball from the same height onto the same floor. She changes only the type of ball and measures the bounce height.
Think: What did Nana keep the same?
2. Understand: Variables
Idea 1: Three kinds
The independent variable is what you change. The dependent variable is what you measure. Controlled variables are kept the same.
Idea 2: Example
Test: Does the ramp height change the distance a car rolls? Independent: ramp height. Dependent: distance. Controlled: car, surface, release method.
Idea 3: Why
If two things change, we cannot tell which caused the result. Controlling variables keeps the test fair.
3. Worked examples
Example 1 (I show you): Name
Bounce test.
- Ball type.
- Height measured.
- Same drop.
Answer: Independent is ball type.
Example 2 (We do it together): Name
Ramp test.
- Height changes.
- Distance measured.
- Same car.
Answer: Dependent is distance.
Example 3 (You try): List
Plant test.
Show the steps and answer
- Same soil.
- Same pot.
- Same water.
Answer: Controls are soil, pot, water.
Did you know?
Real experiments often have many variables, so scientists control as many as they can.
Why this matters
Knowing variables stops muddled results.
4. Explore: Variable hunt
Read three investigations and label the independent, dependent and controlled variables, then plan a bounce test.
- Read each plan.
- Underline what changes.
- Circle what is measured.
- List what stays the same.
Think about it: what did you notice?
What did you notice? Each fair test changes just one thing.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- The ___ variable is what we change.
- The ___ variable is what we measure.
- A ___ variable stays the same.
- Anything that can change is a ___.
Guided practice
Question 1. What is a variable?
Can change.
Question 2. What is independent?
Changed.
Question 3. What is dependent?
Measured.
Independent practice
Level 1: Start
- What is a variable?
- What is independent?
- What is dependent?
- What is controlled?
- How many do we change?
Level 2: Grow
- Why control?
- Why measure?
- Why one change?
Level 3: Stretch
- Label three tests.
- Plan the bounce test.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Name the variables in a test of paper plane length and distance.
Show a sample answer
Use three kinds.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Change one.
Fix: It is measured.
8. Lesson summary and revision card
- I can define variable.
- I can name independent and dependent.
- I can list controlled variables.
- I can spot them in an experiment.
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
- We change one variable at a time.
- We measure the dependent variable.
- We keep other variables controlled.
- Naming variables makes tests clear.
11. Next lesson
Next lesson: Controlled investigations. 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 the three variable kinds. [3 marks]
- Label variables in a test. [4 marks]
- Explain why we control variables. [1 mark]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- 1 each
- Fair test
- Any [1]; reason [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 a variable?
- What is independent?
- What is dependent?
- What is controlled?
- How many do we change?
- Why control?
- Why measure?
- Why one change?
- Label three tests.
- Plan the bounce test.
Homework
Write the variables for a test of your own.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a variable? | Can change. | 1 |
| 2. What is independent? | Changed. | 1 |
| 3. What is dependent? | Measured. | 1 |
| 4. What is controlled? | Same. | 1 |
| 5. How many do we change? | One. | 1 |
| 6. Why control? | Fair. | 1 |
| 7. Why measure? | Evidence. | 1 |
| 8. Why one change? | Know cause. | 1 |
| 9. Label three tests. | Table. | 1 |
| 10. Plan the bounce test. | Plan. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Can change.; 2 Changed.; 3 Measured.; 4 Same.; 5 One.. Level 2: 1 Fair.; 2 Evidence.; 3 Know cause.. Level 3: 1 Table.; 2 Plan.; 3 Sentence..
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 variable | 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 Name independent and dependent | 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 List controlled variables | 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 Spot them in an experiment | 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: “Change all variables.” Change one.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Name variables.
- 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 names variables. You do not need to be an expert to help.
- Plan a bouncing test.
- Ask “What stays the same?”
- Mind rolling balls.
- 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 variable; name independent and dependent; list controlled variables; spot them in an experiment.
Prerequisite knowledge. Grade 4 inquiry ideas: asking questions, fair testing, measuring, recording results in tables and drawing conclusions.
Materials. Balls, ruler. 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. Gather balls.
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). Drop two different balls and ask, “What changed?”
Explanation (10 min). Teach variables.
Guided activity (10 min). Learners label.
Independent activity (10 min). Learners plan.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What do we change? Measure? Keep?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Change all variables.” Change one.
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. Name variables. Enrichment. Look for one new example near your home or school, draw 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: Next Generation Science Standards, Cambridge Primary Science 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 Science curriculum, Grade 5 Unit 1, topic 3; Next Generation Science Standards, science and engineering practices; Cambridge Primary Science Stage 5, thinking and working scientifically; IB Primary Years Programme, how we express ourselves and how the world works. These sources informed the lesson.