Common Core 3.MD.D.8 worksheet

Question 1

A rectangle has a perimeter of 30 cm. Its length is 6 cm. What is its width?

Answer 

Question 2

A square has a perimeter of 68 m. How long is each side?

Answer 

Question 3

Rectangle A is 1 cm by 18 cm. Rectangle B is 2 cm by 9 cm. They have the same area. Which has the greater perimeter?

• A. Rectangle A
• B. Rectangle B

Question 4

A regular pentagon has sides of 5 m. What is its perimeter, in m?

Answer 

Question 5

Aisha says: "If two rectangles have the same area, they must have the same perimeter." True or false? (Think about 2 × 6 and 12 × 1.)

• A. true
• B. false

Question 6

Two rectangles both have a perimeter of 12 cm. One is 2 cm by 4 cm, the other is 3 cm by 3 cm. What is the difference between their areas, in cm²?

Answer 

Question 7

A shape with 4 sides has a perimeter of 30 cm. The known sides are 5 cm, 6 cm, 12 cm. How long is the missing side?

Answer 

Question 8

A rectangle has a perimeter of 32 yd. Its length is 8 yd. What is its width, in yd?

Answer 

Question 9

What is the perimeter of a rectangle 3 yd by 5 yd, in yd?

Answer 

Question 10

A rectangle has a perimeter of 30 cm. Its length is 7 cm. What is its width?

Answer 

Question 11

A square has a perimeter of 24 m. How long is each side?

Answer 

Question 12

Rectangle A is 2 cm by 6 cm. Rectangle B is 1 cm by 12 cm. They have the same area. Which has the greater perimeter?

• A. Rectangle A
• B. Rectangle B

Question 13

A regular octagon has sides of 10 cm. What is its perimeter, in cm?

Answer 

Question 14

Nia says: "If two rectangles have the same area, they must have the same perimeter." True or false? (Think about 3 × 4 and 12 × 1.)

• A. true
• B. false

Question 15

Two rectangles both have a perimeter of 20 cm. One is 1 cm by 9 cm, the other is 5 cm by 5 cm. What is the difference between their areas, in cm²?

Answer 

Question 16

A shape with 3 sides has a perimeter of 27 cm. The known sides are 6 cm, 13 cm. How long is the missing side?

Answer