3md8 Worksheets

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.

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.

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.

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.

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.