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3rd Grade Perimeter Worksheets

3rd Grade Perimeter: find perimeters and missing sides, and compare rectangles with the same area or perimeter. Every worksheet is free, prints as a PDF with an answer key, and can be assigned online. The ones teachers open most are first.

← All 3rd grade topics 3.MD.8

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3rd Grade Perimeter Worksheets - Missing Side (Perimeter) E worksheet

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Missing Side (Perimeter) E

3md8

Student objectives

Use the perimeter of a rectangle to figure out one missing side length.
Add the known side lengths and subtract from the total perimeter to find what is left.
Use the fact that opposite sides of a rectangle are equal to solve for the unknown side.
Write the answer with the correct measurement units.

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3rd Grade Perimeter Worksheets - Missing Side (Area) E worksheet

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Missing Side (Area) E

3md8

Student objectives

Use the area of a rectangle to figure out a missing side length.
Divide the area by the known side to find the unknown side.
Check that the side lengths you found make the correct area when multiplied.

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3rd Grade Perimeter Worksheets - Rectangles - Same Area & Different Perimeter worksheet

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Rectangles - Same Area & Different Perimeter

3md8

Student objectives

Find the area of a rectangle by multiplying length × width.
Find the perimeter of a rectangle by adding all the side lengths.
Use factor pairs to make different rectangles that still have the same area.
Compare rectangles to see how changing the side lengths can change the perimeter even when the area stays the same.

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3rd Grade Perimeter Worksheets - Creating Area and Perimeter Rectangles worksheet

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Creating Area and Perimeter Rectangles

3md8

Student objectives

Find different length-and-width pairs that make a rectangle with a given area.
Find different rectangles that have a given perimeter by choosing side lengths that add up correctly.
Tell the difference between area (square units inside) and perimeter (units around the edge).
Use multiplication and addition to check that a rectangle’s dimensions match the area or perimeter given.

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3rd Grade Perimeter Worksheets - Rectangles - Same Perimeter & Different Area worksheet

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Rectangles - Same Perimeter & Different Area

3md8

Student objectives

Find the area of a rectangle by multiplying length × width.
Find the perimeter of a rectangle by adding all the side lengths.
Create different rectangles that have the same area by using different factor pairs.
Compare rectangles to see how changing the side lengths can change the perimeter even when the area stays the same.

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3rd Grade Perimeter Worksheets - Quadrilaterals (Perimeter) worksheet

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Quadrilaterals (Perimeter)

3md8

Student objectives

Find the perimeter of a rectangle by adding the lengths of all four sides.
Use the fact that opposite sides of a rectangle are equal to find the two lengths that are not labeled.
Recognize that perimeter is a distance around a figure and is measured in ordinary units, not square units.

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3rd Grade Perimeter Worksheets - Perimeter (Real Objects) worksheet

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Perimeter (Real Objects)

3md8

Student objectives

Find the perimeter of a real rectangular object from its labeled width and height.
Read a measurement from a dimension line on a diagram.
Use the fact that opposite sides of a rectangle are equal to account for the two sides that are not labeled.
Attach the correct unit to a perimeter and recognize that it is a length, not an area.

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3rd Grade Perimeter Worksheets - Finding the Missing Side worksheet

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Finding the Missing Side

Student objectives

Find a missing side of an L-shape by subtracting from the long side across from it
Find a long side by adding the short sides across from it
Find two missing sides on one figure, one going across and one going up and down

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3rd Grade Perimeter Worksheets - Perimeter of Rectilinear Shapes worksheet

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Perimeter of Rectilinear Shapes

3md8

Student objectives

Find the missing side lengths of an L-shape or a step shape
Add all the sides of a rectilinear figure to find its perimeter
Count every side once, without skipping or repeating one

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More 3rd grade topics

Multiplication & Division Facts 59 Equivalent & Comparing Fractions 16 Understanding Multiplication & Division 14 Understanding Fractions 13 Area 12 Telling Time & Elapsed Time 25 Bar Graphs & Line Plots 14 Two-Step Word Problems 10 Adding & Subtracting Within 1,000 12 Rounding & Estimating 9 Fractions on a Number Line 5 Properties of Multiplication 13 Multiplying by Multiples of 10 3 Shapes & Polygons 5 Liquid Volume & Mass 4 Patterns & Function Machines 5

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