IMO Practice Test: Area and Perimeter Formulas | Class 4 Mathematics

Question 1 of 6 hard

A rectangle has area 24 sq cm. Which dimensions give the smallest perimeter?

4 cm by 6 cm

1 cm by 24 cm

2 cm by 12 cm

3 cm by 8 cm

Explanation: The closer the sides, the smaller the perimeter: 4×6 gives 20 cm.

Question 2 of 6 hard

A square of side 10 cm has its area and perimeter as numbers. The area is how many times the perimeter?

2.5 times

2 times

4 times

10 times

Explanation: Area = 100, perimeter = 40; 100 ÷ 40 = 2.5.

Question 3 of 6 hard

A rectangle has area 48 sq cm and width 6 cm. What is its length?

8 cm

6 cm

42 cm

288 cm

Explanation: 48 ÷ 6 = 8 cm.

Question 4 of 6 hard

Fencing a square plot needs 48 m of fence. The side is…

12 m

24 m

6 m

16 m

Explanation: 48 ÷ 4 = 12 m.

Question 5 of 6 medium

A square field has a side of 25 m. How far is it around the field?

100 m

625 m

50 m

75 m

Explanation: 4 × 25 = 100 m.

Question 6 of 6 hard

How many 1 cm tiles cover a 9 cm by 5 cm rectangle?

45

28

14

40

Explanation: Area = 9 × 5 = 45 square cm, so 45 tiles.

IMO Practice Test — Area and Perimeter Formulas