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10 printable sets · answer key on every set

Area and Perimeter of Rectangles Worksheets

  • CCSS 3.MD.C.7
  • CCSS 3.MD.D.8
  • 12 problems per set
  • Answer key included

What this skill is

Area is the flat space a rectangle covers, in square units. Perimeter is the distance around its edge, in units.

When it comes up: Third grade, after the multiplication facts.

The mistake to watch for

Mixing the two up: multiplying when asked for the distance around, or adding all four sides when asked for the space inside.

How to help

Draw the rectangle. Trace your finger around the edge for perimeter. Cover it with a grid of squares for area.

Next: Using the same ideas with bigger numbers and unknown sides in fourth grade.

A worked example

A rectangle is 5 units long and 3 units wide. Area: 5 × 3 = 15 square units. Perimeter: 5 + 3 + 5 + 3 = 16 units.

Words to know

area
The amount of flat space a shape covers, measured in square units.
perimeter
The distance all the way around the outside of a shape.
length
How long something is, from one end to the other.
width
How wide something is, from one side to the other.
unit
A fixed amount used for measuring, like a centimeter, a square or a cube.

Practice

Find the area and the perimeter.

Showing Set 1 · 12 problems

  1. A rectangle is 9 units long and 2 units wide. Find its area and its perimeter.
  2. A rectangle is 5 units long and 3 units wide. Find its area and its perimeter.
  3. A rectangle is 10 units long and 10 units wide. Find its area and its perimeter.
  4. A rectangle is 10 units long and 4 units wide. Find its area and its perimeter.
  5. A rectangle is 2 units long and 3 units wide. Find its area and its perimeter.
  6. A rectangle is 3 units long and 7 units wide. Find its area and its perimeter.
  7. A rectangle is 12 units long and 12 units wide. Find its area and its perimeter.
  8. A rectangle is 11 units long and 2 units wide. Find its area and its perimeter.
  9. A rectangle is 7 units long and 9 units wide. Find its area and its perimeter.
  10. A rectangle is 12 units long and 7 units wide. Find its area and its perimeter.
  11. A rectangle is 9 units long and 3 units wide. Find its area and its perimeter.
  12. A rectangle is 12 units long and 4 units wide. Find its area and its perimeter.

Download this set12 problems · answer key included PDF

Answer key
  1. area 18 sq units; perimeter 22 units
  2. area 15 sq units; perimeter 16 units
  3. area 100 sq units; perimeter 40 units
  4. area 40 sq units; perimeter 28 units
  5. area 6 sq units; perimeter 10 units
  6. area 21 sq units; perimeter 20 units
  7. area 144 sq units; perimeter 48 units
  8. area 22 sq units; perimeter 26 units
  9. area 63 sq units; perimeter 32 units
  10. area 84 sq units; perimeter 38 units
  11. area 27 sq units; perimeter 24 units
  12. area 48 sq units; perimeter 32 units

All 10 sets

Each set is a different list of 12 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made
  • Problems are generated for each set and checked against 3.MD.C.7, 3.MD.D.8 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.

Common Core State Standards © 2010 National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.