Free Printable WorksheetScienceGrade 3Science CurriculumENG.3.70

3.70 Identify Controlled Variables in a Test Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 3 Science worksheet provides structured practice on 3.70 Identify Controlled Variables in a Test. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Identify Controlled Variables in a Test - Which option correctly identifies what must stay the same (controls) for a fair test of a design and explain why. (NGSS 3–5-ETS1-3)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 3

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 3.70 Identify Controlled Variables in a Test skill assessments:

Problem 1Difficulty: Mastery

Students design road markers that reflect light at night. Marker A uses aluminum foil. Marker B uses reflective tape. A flashlight shines on the marker, and a student stands back to see which is easier to see.Which option lists the best controls for a fair test of reflective material?

Ause different flashlights; shine from the same angle; test in the same darkness; use the same marker size

Buse the same flashlight; shine from different distances; test in the same darkness; use the same marker size

Cuse the same flashlight and distance; test in different lighting; use the same marker size

Duse the same flashlight and battery strength; shine from the same angle and distance; test in the same darkness/lighting conditions; use markers that are the same size and placed on the same background

Solution & Explanation:A fair test changes only reflective material. The controls should stay the same: use the same flashlight and battery strength; shine from the same angle and distance; test in the same darkness/lighting conditions; use markers that are the same size and placed on the same background. Keeping those conditions the same helps show that any result came from reflective material, not from another change.

Problem 2Difficulty: Mastery

Students compare two spill-proof cup lids. Lid A has one small drinking hole. Lid B has a sliding cover. They fill the cup, close the lid, and shake the cup 12 times to see how much water spills onto a paper towel.Which option best identifies the controls for a fair test of lid design?

Afill with different amounts of water; use the same cup; shake 12 times the same way; measure spills the same way

Bfill the same; use different cups; shake 12 times the same way; measure spills the same way

Cfill with the same amount of water; use the same cup and paper towel size; shake the same number of times with the same strength and direction; measure spilled water the same way (same weighing or same spill outline method)

Dfill the same and use the same cup; shake more times for one lid; measure spills the same way

Solution & Explanation:A fair test changes only lid design. The controls should stay the same: fill with the same amount of water; use the same cup and paper towel size; shake the same number of times with the same strength and direction; measure spilled water the same way (same weighing or same spill outline method). Keeping those conditions the same helps show that any result came from lid design, not from another change.

Problem 3Difficulty: Mastery

Students design coatings to prevent metal nails from rusting. Nail A is coated with clear nail polish. Nail B is coated with wax. They place nails into saltwater for 7 days and compare rust.Which option lists the best controls for a fair test of coating type?

Ause different nail sizes; use the same saltwater; keep temperature the same; score rust the same way

Buse nails that are the same size and metal; use the same saltwater amount and salt concentration; keep the nails in the same container area and temperature; leave them for the same 7 days and score rust with the same chart

Cuse the same nails; use different salt concentrations; keep temperature the same; score rust the same way

Duse the same nails and saltwater; remove one nail earlier; score rust the same way

Solution & Explanation:A fair test changes only coating type. The controls should stay the same: use nails that are the same size and metal; use the same saltwater amount and salt concentration; keep the nails in the same container area and temperature; leave them for the same 7 days and score rust with the same chart. Keeping those conditions the same helps show that any result came from coating type, not from another change.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 3 Science students. It aligns with educational standard ENG.3.70 (Grade 3 science skill focused on Identify Controlled Variables in a Test.).