Grade 3 · Math · Unit 13 of 15
Area & Perimeter
Around and inside shapes
What your child practises
Finding the perimeter (distance around) of rectangles and triangles, finding a missing side, and measuring area in square centimetres and square metres.
Ontario Curriculum expectation: E2.1, E2.7–E2.9 · perimeter of polygons, comparing areas, and square centimetres and square metres
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
A rectangle is 8 cm long and 3 cm wide. What is its area, in square centimetres?
- 24
- 23
- 20
Show answer
24
Hint: Area = length × width.
Question 2
Which unit is best for the area of a classroom floor?
- metres
- square centimetres
- square metres
Show answer
square metres
Hint: A floor is big, so use a big unit. Area uses square units.
Question 3
A rectangle has a perimeter of 28 cm. It is 8 cm long. How wide is it, in centimetres?
- 6
- 3
- 1
Show answer
6
Hint: Half the perimeter is length + width. Take away the length.
Question 4
A rectangle is 4 cm long and 2 cm wide. What is its perimeter in centimetres?
- 14
- 16
- 12
Show answer
12
Hint: Add all four sides: length, width, length, width.
Question 5
A rectangle is 5 cm long and 2 cm wide. What is its area, in square centimetres?
- 8
- 4
- 10
Show answer
10
Hint: Area = length × width.
Question 6
Which rectangle has the same area as a 2 by 8 rectangle?
- 4 by 5
- 4 by 4
- 3 by 8
Show answer
4 by 4
Hint: Work out the area of each rectangle. Look for the same answer.