How should the error-review paper be used?

Redo every item without looking, then check each one; the same mistake twice means it is not mastered yet.

Do perimeter and area use different units?

Perimeter is in cm or m; area is in cm² or m², so always write the unit.

Why does a bigger area not mean a longer perimeter?

The same area can be arranged in different shapes, and the longer and thinner the shape, the longer its perimeter.

P4 Maths Perimeter and Area Applications Paper 4: Error Review

2026-11-09

Tutor Prep Guide · P4 Maths

Ten original items, each with an answer and a one-line explanation.

Direct answers　Items 1-3 are basic, 4-6 intermediate and 7-9 challenge, with item 10 as the error review. Time yourself first, then check each answer and redo what is wrong.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10
Suggested time	20
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: P4 Maths Perimeter and Area Applications
Level	P4

02　Questions (10 items)

FoundationA rectangle is 12 cm long and 7 cm wide. Find its perimeter.
FoundationA square has sides of 9 cm. Find its area.
FoundationA rectangle has area 48 cm² and width 6 cm. Find its length.
IntermediateA square has perimeter 36 cm. Find its area.
IntermediateA carpet measures 2 m by 3 m. Find its area in cm².
IntermediateAn L-shape is a 12 cm by 8 cm rectangle with a 5 cm by 4 cm rectangle cut out. Find its area.
ChallengeA 24 cm wire is bent into a square with nothing left over. Find the area of the square.
ChallengeA garden is 15 m by 8 m. Trees are planted every 2 m all round it, corners included. How many trees?
ChallengeA rectangle is 6 cm by 4 cm. The length grows by 3 cm and the width stays the same. How much does the area increase?
Error redoError review: a pupil says a shape with a larger area must have a longer perimeter. Is that right?

03　Answers and one-line notes

#	Answer	One-line note
1	38 cm	Perimeter = (length + width) × 2 = (12 + 7) × 2 = 38 cm.
2	81 cm²	Area of a square = side × side = 9 × 9 = 81 cm².
3	8 cm	Length = area ÷ width = 48 ÷ 6 = 8 cm, and 8 × 6 = 48 checks it.
4	81 cm²	The side is 36 ÷ 4 = 9 cm, so the area is 9 × 9 = 81 cm².
5	60000 cm²	The area is 6 m², and 1 m² = 10 000 cm², so 6 × 10 000 = 60000 cm².
6	76 cm²	12 × 8 = 96 and 5 × 4 = 20, so the area is 96 − 20 = 76 cm².
7	36 cm²	The wire is the perimeter, so each side is 24 ÷ 4 = 6 cm and the area is 36 cm².
8	23 trees	The perimeter is 46 m and 46 ÷ 2 = 23; going round a closed loop, trees equal gaps.
9	12 cm²	The area goes from 6 × 4 = 24 cm² to 9 × 4 = 36 cm², an increase of 12 cm².
10	No: shapes with the same area can have very different perimeters	A 4 cm by 4 cm square has area 16 cm² and perimeter 16 cm; a 1 cm by 16 cm rectangle has the same area but a perimeter of 34 cm.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

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