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

LessonPrint · 3-5-ETS1-3 · Set 20 · free to copy for classroom use

Answer key — Testing Until It Fails

Set 20. Prints on its own sheet.

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

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.