Perimeter (Year 5)
Calculate the perimeter of 2D shapes by adding side lengths.
The questions below are generated to match the National Curriculum for Year 5 and get harder as you progress from Rookie to Guru.
Worked examples
RookieRead and interpret directly.
Quad angle sum?
- 360°
- 180°
- 90°
- 720°
Answer: 360°. Quad = 360°.
ProCompare and infer.
Isosceles triangle: base angles 70° each. Apex?
- 40°
- 70°
- 110°
- 180°
Answer: 40°. 180 − 70 − 70.
GuruMulti-step reasoning.
Each interior angle of a regular n-gon is 144°. What is n?
- 10
- 8
- 12
- 6
Answer: 10. Exterior 36°; 360/36 = 10.
Related skills
Frequently asked questions
- What is perimeter?
- Calculate the perimeter of 2D shapes by adding side lengths.
- How can my child practise perimeter at home?
- Work through the examples below, then start a free adaptive session. Northstar adjusts the difficulty automatically and tracks mastery over time.
Practise this adaptively
Start a free session that adjusts to your child's level, tracks mastery and celebrates progress.
Start free