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CCSS 3.MD.8 Worksheets

CCSS 3.MD.8 (Common Core, 3rd Grade): "Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.

Measurement and Data Geometric measurement: recognize perimeter as an attribute of plane figures and distinguish between linear and area measures. 8Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.

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3md8

CCSS 3.MD.8 Worksheets - Creating Area and Perimeter Rectangles worksheet

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Creating Area and Perimeter Rectangles

3md8

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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CCSS 3.MD.8 Worksheets - Missing Side (Area) E worksheet

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Missing Side (Area) E

3md8

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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CCSS 3.MD.8 Worksheets - Missing Side (Perimeter) E worksheet

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Missing Side (Perimeter) E

3md8

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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CCSS 3.MD.8 Worksheets - Rectangles - Same Area & Different Perimeter worksheet

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Rectangles - Same Area & Different Perimeter

3md8

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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CCSS 3.MD.8 Worksheets - Rectangles - Same Perimeter & Different Area worksheet

Load up one problem at a time! Ideal for projectors, tablets and computers.

Create a set of flash cards.

Create a distance learning assignment.

Distance Learning

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Rectangles - Same Perimeter & Different Area

3md8

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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CCSS 3.MD.8 Worksheets - Quadrilaterals (Perimeter) worksheet

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Quadrilaterals (Perimeter)

3md8

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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CCSS 3.MD.8 Worksheets - Perimeter (Real Objects) worksheet

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Perimeter (Real Objects)

3md8

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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