9th Grade Area and Perimeter Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the 9th Grade area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Area & Perimeter9th Grade Area and Perimeter Worksheet — Level 1 — Answers
Write the formula, substitute, then calculate. Include units.
1.A rectangle is 10 m long and 8 m wide. Find its area.
Answer: 80 m2
- A = length × width = 10 × 8
- = 80 m2
2.A rectangle is 9 cm long and 6 cm wide. Find its perimeter.
Answer: 30 cm
- P = 2 × (9 + 6)
- = 2 × 15 = 30 cm
3.A rectangle is 5 cm long and 8 cm wide. Find its perimeter.
Answer: 26 cm
- P = 2 × (5 + 8)
- = 2 × 13 = 26 cm
4.A rectangle is 2 cm long and 10 cm wide. Find its area.
Answer: 20 cm2
- A = length × width = 2 × 10
- = 20 cm2
5.A rectangle is 12 mm long and 9 mm wide. Find its area.
Answer: 108 mm2
- A = length × width = 12 × 9
- = 108 mm2
6.A rectangle is 4 cm long and 4 cm wide. Find its area.
Answer: 16 cm2
- A = length × width = 4 × 4
- = 16 cm2
7.A rectangle is 7 mm long and 11 mm wide. Find its area.
Answer: 77 mm2
- A = length × width = 7 × 11
- = 77 mm2
8.A rectangle is 5 cm long and 2 cm wide. Find its area.
Answer: 10 cm2
- A = length × width = 5 × 2
- = 10 cm2
9.A rectangle is 2 mm long and 3 mm wide. Find its area.
Answer: 6 mm2
- A = length × width = 2 × 3
- = 6 mm2
10.A rectangle is 3 cm long and 6 cm wide. Find its area.
Answer: 18 cm2
- A = length × width = 3 × 6
- = 18 cm2
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.