Free Printable WorksheetMathGrade 4Math Curriculum4.MD.A.3

4.126 Find Missing Side Lengths Given Area or Perimeter Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 4 Math worksheet provides structured practice on 4.126 Find Missing Side Lengths Given Area or Perimeter. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Given the area or perimeter of a rectangle and one side length, select the missing side length. (CCSS 4.MD.A.3; FL B.E.S.T. MA.4.GR.2.1)

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 4

Subject

Math

Domain

Math 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 4.126 Find Missing Side Lengths Given Area or Perimeter skill assessments:

Problem 1Difficulty: Mastery
Use the final rectangle diagram. The perimeter is 294 feet, and one side is labeled 44 feet. What is the missing side length in feet?
Solution & Explanation:A rectangle's perimeter is twice the sum of two adjacent sides. Half the perimeter is 294 ÷ 2 = 147; then 147 − 44 = 103, so the missing side length is 103.
Problem 2Difficulty: Mastery
A rectangular map outline has perimeter 288 centimeters. One side is 42 centimeters. What is the missing side length in centimeters?
Solution & Explanation:A rectangle's perimeter is twice the sum of two adjacent sides. Half the perimeter is 288 ÷ 2 = 144; then 144 − 42 = 102, so the missing side length is 102.
Problem 3Difficulty: Mastery
A rectangular roof frame has perimeter 282 yards. One side length is 40 yards. What is the side length that is not shown in yards?
Solution & Explanation:A rectangle's perimeter is twice the sum of two adjacent sides. Half the perimeter is 282 ÷ 2 = 141; then 141 − 40 = 101, so the missing side length is 101.

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Frequently Asked Questions

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 4 Math students. It aligns with educational standard 4.MD.A.3 (Primary standard selected for prompt fields in this prompt cell: CCSS 4.MD.A.3. Skill statement in this prompt cell: Given the area or perimeter of a rectangle and one side length, select the missing side length. Associated standards listed with this skill in this prompt cell: CCSS 4.MD.A.3; FL B.E.S.T. MA.4.GR.2.1. Use this prompt-provided wording as the supporting standard description for this workflow.).

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