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Plan Fair Tests
Grade 4 - Science - Building Confidence
Worksheet 1
1Fair-test plan: for the problem "a warning code must send three messages with light," which test would compare solutions clearly?
2Which variable should stay the same while testing designs for "a paper bridge must hold 20 washers"?
3Evidence: the side-channel roof kept the doorway dry twice. Which improvement follows from the data?
4Why should engineers repeat a test for "a paper bridge must hold 20 washers"?
5Which data table heading best fits a fair test for "a model roof must drain rainwater away from a doorway"?
6Fair-test plan: for the problem "a wind barrier must stop soil from blowing away," which test would compare solutions clearly?
7Which variable should stay the same while testing designs for "a model roof must drain rainwater away from a doorway"?
8Evidence: folded beams held 24 washers while flat paper held 9. Which improvement follows from the data?
9Why should engineers repeat a test for "a wind barrier must stop soil from blowing away"?
10Which data table heading best fits a fair test for "a wind barrier must stop soil from blowing away"?
About this worksheet
Planning fair tests helps students compare designs using evidence instead of opinion asks fourth graders to connect observations with an explanation, model, or design decision instead of choosing a fact from memory. Students may change several variables at once, which makes the results hard to explain. This worksheet uses short investigations and evidence-based situations so students must read what happened, decide which science idea is being tested, and choose the answer that fits the title. Students choose fair test procedures, identify controlled variables, read design data, and select improvements from test results. Support versions use familiar objects and direct wording. Standard and challenge versions add closer distractors, fair-test language, and multi-step evidence. Ask your child to point to the measurement, diagram, map, or observation before answering. If the choice does not explain the evidence in the prompt, it is probably a distractor. That habit keeps science reasoning tied to data rather than guesswork.
What your child will learn
Plan fair tests
Control variables
Use measurements
Read test evidence
Improve designs
Worked example
To compare two bridge designs, add washers one at a time in the same place on each bridge until it bends.
Common mistake
Testing one design with more weight or a different surface and then comparing the results.
Helpful hint
Change only the design being tested; keep conditions the same.
Worksheet 1