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Grade 3 Area & Perimeter Worksheet with Answers

Grade 3 (US) · Year 4 (UK) · Class 3 (India) · Math

Unit 4: Measurement & DataArea & PerimeterCCSS 3.MD.D.8

Finding the area and perimeter of rectangles and squares, missing side lengths, L-shaped rooms and real-life problems like fencing a garden. This free upper elementary worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Area & Perimeter

Grade 3 · Math

Score___ / 12

Name

Class

Date

Learning goal: Area & Perimeter · CCSS 3.MD.D.8

Directions: Use the pictures to help you. Solve each problem. Show your work, then write your answer in the box.

Example

A square has sides of 6 m. What is its perimeter?

Answer: 24 m

RememberArea and perimeter

RectangleA = l × wPerimeterP = add all sidesTriangleA = ½ × b × h
  1. 1

    A rectangle has an area of 100 ft². Its length is 10 ft. What is its width?

    10 ft?Area = 100 ft²
    Answer
  2. 2

    A rectangle has a perimeter of 30 cm. Its length is 8 cm. What is its width?

    8 cm?Perimeter = 30 cm
    Answer
  3. 3

    A rectangle has a perimeter of 32 ft. Its length is 11 ft. What is its width?

    11 ft?Perimeter = 32 ft
    Answer
  4. 4

    Find the area of a rectangle 13 cm long and 13 cm wide.

    13 cm13 cm
    Answer
  5. 5

    A garden is 7 m long and 12 m wide. How many meters of fence are needed to go all the way around it?

    7 m12 m
    Answer
  6. 6

    A rectangle has a perimeter of 18 cm. Its length is 5 cm. What is its width?

    5 cm?Perimeter = 18 cm
    Answer
  7. 7

    Find the perimeter of a rectangle 3 ft long and 13 ft wide.

    3 ft13 ft
    Answer
  8. 8

    Find the perimeter of a rectangle 9 ft long and 3 ft wide.

    9 ft3 ft
    Answer
  9. 9

    A rectangle has an area of 30 cm². Its length is 3 cm. What is its width?

    3 cm?Area = 30 cm²
    Answer
  10. 10

    Find the perimeter of a rectangle 6 cm long and 10 cm wide.

    6 cm10 cm
    Answer
  11. 11

    A rectangle has a perimeter of 34 ft. Its length is 5 ft. What is its width?

    5 ft?Perimeter = 34 ft
    Answer
  12. 12

    Find the perimeter of a rectangle 2 cm long and 10 cm wide.

    2 cm10 cm
    Answer

★ Challenge corner for fast finishers

I am thinking of a number. If I take away 3, I get 1. What is my number?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/3/area_perimeter

Answer key (click to show)
  1. 1.10 ft
  2. 2.7 cm
  3. 3.5 ft
  4. 4.169 cm²
  5. 5.38 m
  6. 6.4 cm
  7. 7.32 ft
  8. 8.24 ft
  9. 9.10 cm
  10. 10.32 cm
  11. 11.12 ft
  12. 12.24 cm
  13. ★4 (challenge corner)

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How to use this worksheet

  • Use it as a 10–15 minute warm-up or homework task rather than a long drill.
  • Ask students to show their working so you can see where a mistake started, not just that it happened.
  • Mark it with the answer key together, then print a fresh version of the same topic to practise the questions they missed.

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