Variables Worksheets

Free printable variables worksheets (PDF): practice identifying independent, dependent and controlled variables, spotting unfair tests and reading graphs, with answer keys. No sign-up, no email.

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Independent, dependent, controlled — three words that students can define perfectly and still get wrong the moment they are looking at an actual experiment. The practice sheets here give them real experiments to take apart: what was deliberately changed, what was measured, what had to stay the same, and whether there was a control group. Every practice sheet has its own answer key.

Four levels of identify-the-variables practice: Level 1 (ages 7–9) uses plain fair-test language; Level 2 (ages 9–11) introduces the three terms; Level 3 (ages 11–14) adds the values tested, units and control groups; Level 4 asks students to spot what makes a test unfair and fix it. There is also a Types of Variables sheet (sorting factors, finding variables in a hypothesis, and control group versus controlled variable), a Variables in Tables and Graphs sheet with clearly labelled example data, and blank planning templates for students' own investigations in three age bands. Black and white, one sheet per US Letter page.

fair test practice — level 1 (ages 7–9) — free printable science worksheet Fair Test Practice — Level 1 (Ages 7–9)Download PDF ↓ identifying variables practice — level 2, set a (ages 9–11) — free printable science worksheet Identifying Variables Practice — Level 2, Set A (Ages 9–11)Download PDF ↓ identifying variables practice — level 2, set b (ages 9–11) — free printable science worksheet Identifying Variables Practice — Level 2, Set B (Ages 9–11)Download PDF ↓ identifying variables practice — level 3, set a (ages 11–14) — free printable science worksheet Identifying Variables Practice — Level 3, Set A (Ages 11–14)Download PDF ↓ identifying variables practice — level 3, set b (ages 11–14) — free printable science worksheet Identifying Variables Practice — Level 3, Set B (Ages 11–14)Download PDF ↓ spot the unfair test — level 4, set a (ages 10–13) — free printable science worksheet Spot the Unfair Test — Level 4, Set A (Ages 10–13)Download PDF ↓ spot the unfair test — level 4, set b (ages 10–13) — free printable science worksheet Spot the Unfair Test — Level 4, Set B (Ages 10–13)Download PDF ↓ types of variables: independent, dependent and controlled (ages 10–14) — free printable science worksheet Types of Variables: Independent, Dependent and Controlled (Ages 10–14)Download PDF ↓ variables in tables and graphs (ages 11–14) — free printable science worksheet Variables in Tables and Graphs (Ages 11–14)Download PDF ↓ making a fair test — template (ages 5–7) — free printable science worksheet Making a Fair Test — Template (Ages 5–7)Download PDF ↓ variables in an experiment — template (ages 8–10) — free printable science worksheet Variables in an Experiment — Template (Ages 8–10)Download PDF ↓ variables and controls — template (ages 11–14) — free printable science worksheet Variables and Controls — Template (Ages 11–14)Download PDF ↓ fair test practice — level 1 (ages 7–9) answer key — free printable science worksheet Fair Test Practice — Level 1 (Ages 7–9) — Answer Key Answer keyDownload PDF ↓ identifying variables practice — level 2, set a (ages 9–11) answer key — free printable science worksheet Identifying Variables Practice — Level 2, Set A (Ages 9–11) — Answer Key Answer keyDownload PDF ↓ identifying variables practice — level 2, set b (ages 9–11) answer key — free printable science worksheet Identifying Variables Practice — Level 2, Set B (Ages 9–11) — Answer Key Answer keyDownload PDF ↓ identifying variables practice — level 3, set a (ages 11–14) answer key — free printable science worksheet Identifying Variables Practice — Level 3, Set A (Ages 11–14) — Answer Key Answer keyDownload PDF ↓ identifying variables practice — level 3, set b (ages 11–14) answer key — free printable science worksheet Identifying Variables Practice — Level 3, Set B (Ages 11–14) — Answer Key Answer keyDownload PDF ↓ spot the unfair test — level 4, set a (ages 10–13) answer key — free printable science worksheet Spot the Unfair Test — Level 4, Set A (Ages 10–13) — Answer Key Answer keyDownload PDF ↓ spot the unfair test — level 4, set b (ages 10–13) answer key — free printable science worksheet Spot the Unfair Test — Level 4, Set B (Ages 10–13) — Answer Key Answer keyDownload PDF ↓ types of variables: independent, dependent and controlled (ages 10–14) answer key — free printable science worksheet Types of Variables: Independent, Dependent and Controlled (Ages 10–14) — Answer Key Answer keyDownload PDF ↓ variables in tables and graphs (ages 11–14) answer key — free printable science worksheet Variables in Tables and Graphs (Ages 11–14) — Answer Key Answer keyDownload PDF ↓

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Frequently asked questions

What is the difference between independent and dependent variables?
The independent variable is the one you choose to change — the amount of water, the type of surface, the temperature setting. The dependent variable is what you measure to see the effect — the height, the distance, the time taken. A useful check: the dependent variable depends on the independent one, never the other way round.
Why do controlled variables matter so much?
Because without them you cannot say the independent variable caused anything. If one plant gets more water and also sits on a sunnier windowsill, the extra growth has two possible causes and the experiment cannot separate them. Listing controlled variables in advance is how you spot that before running the test.
Are controlled variables the same as a control group?
No, and the similar names cause endless confusion. Controlled variables are the conditions you keep identical across every trial. A control group is a whole extra trial that receives no treatment, used as a baseline for comparison. An experiment can have both.
Which level should I use?
As an editorial guide: Level 1 for ages 7–9, who can say what was changed and what was measured in everyday words; Level 2 for ages 9–11, when the terms independent, dependent and controlled are introduced; Level 3 for ages 11–14, who should give values, units and control groups; Level 4 once students can identify variables and are ready to judge whether a test is fair.
Do the worksheets come with answer keys?
Yes. Every practice sheet has a matching answer key. Where more than one answer is reasonable — for example, which controlled variables a student names — the key lists the acceptable options, and every controlled variable it credits is stated in the experiment text.