This grade 3 perimeter quiz asks 10 multiple-choice questions on perimeter, and each answer comes with a short explanation.
Ten multiple-choice questions on perimeter: adding side lengths, unknown sides, squares and rectangles, and comparing shapes with the same perimeter or area. Choose the one correct answer, then read the explanation.
Grade 3Common Core: 3.MD.D.8
🎯 Perimeter – Grade 3 math quiz
Score: 0 / 10
Answered: 0 / 10
Question 1
What is the perimeter of the triangle?A triangle with sides 4, 5 and 6 cm.
A10 cm
B15 cm
C20 cm
D30 cm
Question 2
A rectangle is 9 inches long and 5 inches wide. What is its perimeter?
A14 inches
B45 inches
C19 inches
D28 inches
Question 3
A square has sides of 7 feet. What is its perimeter?
A14 feet
B28 feet
C49 feet
D21 feet
Question 4
A triangle has a perimeter of 30 cm. Two sides are 11 cm and 9 cm. How long is the third side?
A10 cm
B20 cm
C30 cm
D50 cm
Question 5
A rectangle has a perimeter of 26 cm and a length of 8 cm. What is its width?
A5 cm
B18 cm
C13 cm
D10 cm
Question 6
All sides of the regular hexagon are 3 inches long. What is its perimeter?A regular hexagon.
A9 inches
B12 inches
C36 inches
D18 inches
Question 7
All three rectangles have a perimeter of 20 units. Which has the greatest area?Three rectangles with the same perimeter.
AThe 8 by 2 rectangle
BThe 7 by 3 rectangle
CThe 5 by 5 square
DThey all have the same area
Question 8
Which rectangle has a perimeter of 18 units?
A7 by 2
B6 by 4
C5 by 3
D5 by 5
Question 9
A 12 by 1 rectangle and a 3 by 4 rectangle both have an area of 12 square units. What are their perimeters?
A13 units and 7 units
B26 units and 26 units
C12 units and 12 units
D26 units and 14 units
Question 10
A rectangular yard is 15 feet long and 10 feet wide. Fence comes in 10-foot sections. How many sections go all the way around?
A25 sections
B15 sections
C5 sections
D50 sections
🎉 Quiz complete!
0 / 10
How does this quiz work?
Read each question, choose one answer among A, B, C and D, then check it: a short explanation appears after every answer. Your score out of 10 is shown at the end, and you can restart the quiz as often as you like.
What should you review before the quiz?
Reread the key facts of the lesson and the worked example. If a question is hard, go back to the matching part of the lesson, then try the quiz again. Write your work on scrap paper: most mistakes come from skipping a step, not from the idea itself.
Remember:
Perimeter is the total distance around a polygon.
Add all the side lengths to find the perimeter.
A rectangle’s perimeter is length + width + length + width.
For an unknown side, subtract the known sides from the perimeter.
Rectangles with the same perimeter can have different areas.
How to use this grade 3 perimeter quiz
Retake this grade 3 perimeter quiz until every answer is right, then move on to the worksheet and the test.
