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🧠 Perimeter: Show Your Thinking (3.MD.D.8)

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Solve real-world problems involving perimeters of polygons. Solve each problem and show your work.

1. Rectangle 4 m by 10 m. Perimeter = ___ m
Show your work
2. A rectangle has perimeter 28 m and length 6 m. Width = ___ m
Show your work
3. Rectangle 15 m by 5 m. Perimeter = ___ m
Show your work
4. A rectangle has perimeter 46 m and length 14 m. Width = ___ m
Show your work
5. Rectangle 12 m by 6 m. Perimeter = ___ m
Show your work
6. A rectangle has perimeter 40 m and length 14 m. Width = ___ m
Show your work

Explain: How did you solve problem 1? Could you check it another way?

Answer key: 1) 28 · 2) 8 · 3) 40 · 4) 9 · 5) 36 · 6) 6
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Worksheets › Grade 3 Math › Perimeter › Perimeter

Grade 3 (ages 8–9)Numbers & mathsFree printable PDF

About this grade 3 worksheet

Free Grade 3 math worksheet (Common Core 3.MD.D.8): perimeter — problems with space to show work and explain reasoning, with answer key. Skill: Solve real-world problems involving perimeters of polygons. Level: Grade 3 — also suits Year 4 (UK).

For teachers: skills & standards

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What age is it for?

It is designed for Grade 3 (ages 8–9), but use it with any child who is ready.

What skills does it build?

Solve real-world problems involving perimeters of polygons.

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More “Perimeter” printables (3.md.d.8: solve real-world problems involving perimeters of polygons)

Perimeter: Practice A (3.MD.D.8) · Perimeter: Practice B (3.MD.D.8) · Perimeter: Mixed Practice & Reasoning (3.MD.D.8) · Perimeter: Quick Check (3.MD.D.8)

All 5 perimeter sheets → · Grade 3 Math: all 10 skills → · All Common Core grades

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