Mathyqo — Adaptive math practice for Ontario kids

MathIQO worksheet

Calculate the perimeter of rectangles and other polygons · Grade 4 · E2.1

Name: ______________________

Date: ______________________

1
A rectangle is 9 cm wide and 9 cm tall. What is its perimeter, in centimetres?
Warm-up
Answer:
2
A rectangle is 3 cm wide and 8 cm tall. What is its perimeter, in centimetres?
Warm-up
Answer:
3
A rectangle is 5 cm wide and 7 cm tall. What is its perimeter, in centimetres?
Warm-up
Answer:
4
A rectangle is 15 cm wide and 22 cm tall. What is its perimeter, in centimetres?
On level
Answer:
5
A rectangle is 16 cm wide and 11 cm tall. What is its perimeter, in centimetres?
On level
Answer:
6
A rectangle is 22 cm wide and 20 cm tall. What is its perimeter, in centimetres?
On level
Answer:
7
A regular pentagon has 5 equal sides. Each side is 23 cm long. What is its perimeter, in centimetres?
Challenge
Answer:
8
A regular octagon has 8 equal sides. Each side is 17 cm long. What is its perimeter, in centimetres?
Challenge
Answer:
9
A regular triangle has 3 equal sides. Each side is 23 cm long. What is its perimeter, in centimetres?
Challenge
Answer:

✅ Done? See how you did — check in at mathiqo.com/check-in

Worksheet code: eyJzIjoic3BhdGlhbC1wZXJpbWV0ZXItcmVjdGFuZ2xlIiwiZCI6Wzc5Mzk1Nzk1MiwxODk4NzY4NTMsMTc5NzQ2MDM4MSwyNzYwOTI2MzksMTM3MjU0NjMwLDE1MjU0MDcxMDgsODcwOTI0NzM3LDIxMjIyMzU5NDksMTQ0ODAwODI0N10sInYiOjF9.27b36b19fbd5

A quick 5-question check-in grades itself instantly and shows what to practise next.

Answer key · Calculate the perimeter of rectangles and other polygons

1.
36 — Perimeter = 2 × (width + height) = 2 × (9 + 9) = 36.
2.
22 — Perimeter = 2 × (width + height) = 2 × (3 + 8) = 22.
3.
24 — Perimeter = 2 × (width + height) = 2 × (5 + 7) = 24.
4.
74 — Perimeter = 2 × (width + height) = 2 × (15 + 22) = 74.
5.
54 — Perimeter = 2 × (width + height) = 2 × (16 + 11) = 54.
6.
84 — Perimeter = 2 × (width + height) = 2 × (22 + 20) = 84.
7.
115 — Perimeter = number of sides × side length = 5 × 23 = 115.
8.
136 — Perimeter = number of sides × side length = 8 × 17 = 136.
9.
69 — Perimeter = number of sides × side length = 3 × 23 = 69.