UNDERSTAND · PRACTISE · REVIEW
Trace the boundary of a rectangle and label each side. Perimeter measures the distance around the shape, so use a length unit. Do not confuse it with the area inside.
A worked example
Try this learning routine
- Read the explanation and say the idea in your own words.
- Cover the worked answer and attempt a similar question.
- Check each step, including units or word meaning.
- Record one mistake and retry a new example later.
Independent practice
Choose one answer for each question and write a reason. These are foundation activities, not a complete board examination.
A rectangle is 21 cm long and 3 cm wide. Its perimeter in cm is:
A rectangle is 22 cm long and 4 cm wide. Its perimeter in cm is:
A rectangle is 23 cm long and 5 cm wide. Its perimeter in cm is:
A rectangle is 24 cm long and 6 cm wide. Its perimeter in cm is:
A rectangle is 25 cm long and 7 cm wide. Its perimeter in cm is:
A rectangle is 26 cm long and 8 cm wide. Its perimeter in cm is:
Answers and explanations
- 48 — Perimeter = 2(length + width) = 2(21 + 3) = 48 cm.
- 52 — Perimeter = 2(length + width) = 2(22 + 4) = 52 cm.
- 56 — Perimeter = 2(length + width) = 2(23 + 5) = 56 cm.
- 60 — Perimeter = 2(length + width) = 2(24 + 6) = 60 cm.
- 64 — Perimeter = 2(length + width) = 2(25 + 7) = 64 cm.
- 68 — Perimeter = 2(length + width) = 2(26 + 8) = 68 cm.
Your next step
Use the same idea in a fresh example. Bring the method and your questions to a discussion with TRICEF, rather than relying on a score alone.
Original TRICEF Academy practice material. Not an official board paper. Open the answer section before printing if you want the answer key included.