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Which One Actually Worked? is a free printable Kindergarten to Grade 2 science worksheet on comparing test results from two designs, aligned to NGSS performance expectation K-2-ETS1-3. It prints 4 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 1 of 25 · the same problems every time you open this link.

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One paper per student

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All 25 sets ask different questions.

Which One Actually Worked?

K-2-ETS1-3

NameDate

Look at the results, then answer.

1.
StrawPlasticPaperMetal0123456789101112
Four whistle designs were tested. Which was heard furthest away?
2.
Drum 1Drum 2Drum 30123456789
Three drums were tested. How many times was drum 2 heard?
3.
BlindNetCurtainNothing0123456789101112
Four coverings were tested on a window. Which made the room darkest?
4.
Waved cardboardFlashlightShoutSticks0123456789
Four signals were tested. Which worked least often?

LessonPrint · K-2-ETS1-3 · Set 1 · free to copy for classroom use

Answer key — Which One Actually Worked?

Set 1. Prints on its own sheet.

  1. 1.The metal whistle, heard 12 steps away.
  2. 2.9 times.
  3. 3.The blind, letting in only 2.
  4. 4.The sticks, heard only 4 times out of 10.

Questions about Which One Actually Worked?

What does the Which One Actually Worked? worksheet cover?

It practices comparing test results from two designs — 4 questions for Kindergarten to Grade 2, all on NGSS K-2-ETS1-3: Test two designs for the same problem and compare how each performs. The instruction to students is “Look at the results, then answer”, and the answer key follows on the next sheet.

Which NGSS performance expectation does Which One Actually Worked? practice?

K-2-ETS1-3, under Engineering Design for Kindergarten to Grade 2. The published performance expectation reads: “Analyze data from tests of two objects designed to solve the same problem to compare the strengths and weaknesses of how each performs.” The worksheet assesses that performance expectation rather than a paraphrase of it.

What age or grade is this worksheet for?

Which One Actually Worked? is written for Kindergarten to Grade 2, typically ages 7-8. It is one of the sheets on K-2-ETS1-3, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.

Does Which One Actually Worked? come with an answer key?

Yes. All 4 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Which One Actually Worked? can I print?

25 — one per student, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Which One Actually Worked? free to print and photocopy?

Yes. Which One Actually Worked?, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

Is there a lesson plan to teach K-2-ETS1-3?

Yes — “Which One Actually Worked?” is a 50-minute Kindergarten to Grade 2 plan for K-2-ETS1-3, timed section by section, with the misconceptions to expect and an exit ticket. Which One Actually Worked? is the practice that follows it.

More practice for K-2-ETS1-3

Test two designs for the same problem and compare how each performs.

Teaching this next? Which One Actually Worked? is the 50-minute plan for it, with the misconceptions to expect.

All Kindergarten to Grade 2 worksheets

Last reviewed 2026-09-05. Aligned to K-2-ETS1-3 of the Next Generation Science Standards.