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

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One paper per pupil

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

LessonPrint · 3-5-ETS1-3 · Set 2 · free to copy for classroom use

Answer key — Keeping the Test Fair

Set 2. Prints on its own sheet.

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

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.