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Testing Until It Fails is a free printable Grade 3 to Grade 5 science worksheet on fair tests with variables controlled to find what to improve, 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 17 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.

Testing Until It Fails

3-5-ETS1-3

NameDate

Circle the best answer.

1.What should be recorded besides the result?
  • A.The weather
  • B.Who worked hardest
  • C.Every variable held constant, so somebody else can judge the test
2.A filter leaks at the seal every time. What is that?
  • A.A failure point, and the thing to redesign first
  • B.A reason to abandon the design
  • C.Bad luck
3.Why run each test three times?
  • A.One run may reflect a build fault rather than the design
  • B.To fill the lesson
  • C.To use more water
4.After the seal is fixed, the frame collapses instead. What does that show?
  • A.The design got worse
  • B.The failure point moved, so the first fix worked
  • C.Nothing was learned
5.You test three filter designs. What must be identical?
  • A.The water, the volume poured and how clarity is judged
  • B.The colour of the containers
  • C.Who pours
6.A prototype passes every test easily. What should you do next?
  • A.Test it harder until it fails, to find its limit
  • B.Stop testing
  • C.Declare it finished
7.Why is identifying a failure point more useful than a pass or fail?
  • A.It tells you exactly what to improve
  • B.It is not more useful
  • C.It is quicker to write
8.You change the filter material and the seal together. What is the problem?
  • A.Nothing, it improved
  • B.You cannot attribute the change in performance to either
  • C.It saves a lesson

LessonPrint · 3-5-ETS1-3 · Set 17 · free to copy for classroom use

Answer key — Testing Until It Fails

Set 17. Prints on its own sheet.

  1. 1.Every variable held constant, so somebody else can judge the test
  2. 2.A failure point, and the thing to redesign first
  3. 3.One run may reflect a build fault rather than the design
  4. 4.The failure point moved, so the first fix worked
  5. 5.The water, the volume poured and how clarity is judged
  6. 6.Test it harder until it fails, to find its limit
  7. 7.It tells you exactly what to improve
  8. 8.You cannot attribute the change in performance to either

More practice for 3-5-ETS1-3

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

Teaching this next? Testing Until It Fails is the 60-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.