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Weighing Up Several Ideas is a free printable Grade 3 to Grade 5 science worksheet on comparing solutions against criteria and constraints, aligned to Common Core standard 3-5-ETS1-2. 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 7 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.

Weighing Up Several Ideas

3-5-ETS1-2

NameDate

Circle the best answer.

1.Three designs are compared. What should the comparison be based on?
  • A.Which took longest
  • B.How well each meets each criterion and constraint
  • C.Which looks best
2.A design works well but breaks the five pound limit. What is it?
  • A.The best solution
  • B.A solution that fails a constraint, however well it works
  • C.A criterion
3.What should you do with a rejected design?
  • A.Pretend it never existed
  • B.Record why it failed, in case part of it is useful
  • C.Throw it away
4.Two designs meet the criteria. One costs less. Which do you choose?
  • A.The cheaper one, since both meet the criteria
  • B.The larger one
  • C.The one you built
5.Two designs tie on every criterion. What else could decide?
  • A.Which is heavier
  • B.Which is easier to repair or reuse
  • C.Which was drawn first
6.Why generate several solutions before choosing?
  • A.The first idea is rarely the best against the criteria
  • B.To take longer
  • C.To use more paper
7.A design meets every criterion but nobody can build it in the time. What follows?
  • A.It fails a constraint and cannot be chosen as it stands
  • B.Constraints do not matter
  • C.It wins anyway
8.Why compare solutions against the criteria rather than each other?
  • A.The criteria say what counts as success
  • B.It is quicker
  • C.Criteria are optional

LessonPrint · 3-5-ETS1-2 · Set 7 · free to copy for classroom use

Answer key — Weighing Up Several Ideas

Set 7. Prints on its own sheet.

  1. 1.How well each meets each criterion and constraint
  2. 2.A solution that fails a constraint, however well it works
  3. 3.Record why it failed, in case part of it is useful
  4. 4.The cheaper one, since both meet the criteria
  5. 5.Which is easier to repair or reuse
  6. 6.The first idea is rarely the best against the criteria
  7. 7.It fails a constraint and cannot be chosen as it stands
  8. 8.The criteria say what counts as success

More practice for 3-5-ETS1-2

Compare several possible solutions against the criteria and the constraints.

Teaching this next? Weighing Up Several Ideas 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-ETS1-2 of the Next Generation Science Standards.