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Keeping the Test Fair is a free printable Grade 3 to Grade 5 science worksheet on planning fair tests with variables controlled, aligned to Common Core standard 3-5-ETS1-3. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 22 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Keeping the Test Fair

3-5-ETS1-3

NameDate

Circle the best answer.

1.You test two windbreaks. What must be the same for both?
  • A.Nothing at all
  • B.The wind, the place and how you measure the damage
  • C.The colour of each
2.Why record what you controlled as well as what you changed?
  • A.It is not necessary
  • B.To fill the page
  • C.So somebody else can judge whether the test was fair
3.In a slope test, what is the variable you change?
  • A.The cover on the slope
  • B.The amount of water
  • C.The angle of the slope
4.A pupil tests one design outdoors and one indoors. What is wrong?
  • A.Nothing, both were tested
  • B.The conditions differ, so the results cannot be compared
  • C.Indoors is always better
5.You change two things and the result improves. What is the problem?
  • A.Two changes are always better
  • B.Nothing, it improved
  • C.You cannot tell which change helped
6.Why run each test more than once?
  • A.To make the sheet longer
  • B.One result might be unusual
  • C.To use more time
7.What is a failure point?
  • A.A test that was not done
  • B.A design nobody liked
  • C.The part that gives way first under test
8.Your model bridge fails at the same joint every time. What does that tell you?
  • A.Bridges cannot be improved
  • B.The whole design is fine
  • C.That joint is the failure point to improve

LessonPrint · 3-5-ETS1-3 · Set 22 · free to copy for classroom use

Answer key — Keeping the Test Fair

Set 22. Prints on its own sheet.

  1. 1.The wind, the place and how you measure the damage
  2. 2.So somebody else can judge whether the test was fair
  3. 3.The cover on the slope
  4. 4.The conditions differ, so the results cannot be compared
  5. 5.You cannot tell which change helped
  6. 6.One result might be unusual
  7. 7.The part that gives way first under test
  8. 8.That joint is the failure point to improve

More practice for 3-5-ETS1-3

Run fair tests, controlling the variables, to find what to improve.

Teaching this next? Keeping the Test Fair is the 55-minute plan for it, with the misconceptions to expect.

All Grade 3 to Grade 5 worksheets

Last reviewed 2026-09-05. Aligned to 3-5-ETS1-3 of the Next Generation Science Standards.