P4 Maths: Area Units And Conversion (Paper 4 (error Clinic))

P4 Maths: Area Units and Conversion (Paper 4 (error clinic))

2026-11-15

Tutor Prep Guide · How square metres and square centimetres relate, which way to multiply or divide when converting area units, keeping side length apart from area, comparing areas given in different units, and diagnosing common slips

P4 Maths: Area Units and Conversion (Paper 4 (error clinic))

Ten area unit conversion questions on square metres and square centimetres, square kilometres, mixed measurements and comparing areas, with answers and one-line notes.

Level: Primary 4 Maths; format: converting area units, splitting mixed measurements, comparing areas, finding a missing side and diagnosing wrong work.　Primary 4 area unit conversion practice: ten questions on 1 square metre = 10 000 square centimetres, square kilometres, mixed measurements, comparing areas and common slips, each with an answer and a one-line note.

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: Area Units and Conversion
Level	P4

02　Questions (10 items)

FoundationHow many square centimetres are there in 4 square metres?
FoundationHow many square metres are there in 6 000 square centimetres?
FoundationA square has sides of 1 m. What is its area in square centimetres?
IntermediateHow many square metres are there in 90 000 square centimetres?
IntermediateHow many square centimetres are there in 1.5 square metres?
IntermediateHow many square metres are there in 32 000 square centimetres?
ChallengeA floor is 8 m long and 5 m wide. Give its area in square metres and in square centimetres.
ChallengeWhich is larger, 7 500 square centimetres or 0.8 square metres, and by how many square centimetres?
ChallengeA board is 2 m long and 45 cm wide. What is its area in square centimetres, and in square metres?
Error redoA student said that 100 square centimetres is 1 square metre because 100 cm = 1 m. Where is the mistake, and what is 100 square centimetres in square metres?

03　Answers and one-line notes

#	Answer	One-line note
1	40 000 square centimetres.	The common slip is 400; the correct step multiplies by 10 000, so 4 x 10 000 = 40 000.
2	0.6 square metres.	Divide by 10 000 to get 0.6, and an answer below one square metre is perfectly normal.
3	10 000 square centimetres.	One metre is 100 centimetres, so 100 x 100 = 10 000, which is one square metre.
4	9 square metres.	Divide 90 000 by 10 000 to get 9; counting the groups of 10 000 prevents a place-value slip.
5	15 000 square centimetres.	Multiply 1.5 by 10 000 to get 15 000, treating the whole part and the decimal part together.
6	3.2 square metres.	Divide 32 000 by 10 000 to get 3.2; the remaining 2 000 square centimetres is 0.2 square metres.
7	40 square metres, that is 400 000 square centimetres.	Eight times five is 40 square metres, and 40 x 10 000 = 400 000 square centimetres.
8	0.8 square metres is larger by 500 square centimetres.	0.8 square metres is 8 000 square centimetres, and 8 000 – 7 500 = 500.
9	9 000 square centimetres, that is 0.9 square metres.	Two metres is 200 cm, and 200 x 45 = 9 000 square centimetres, which is 0.9 square metres.
10	The length conversion was used for an area; 100 square centimetres is 0.01 square metres.	That 100 cm = 1 m describes length only, while area multiplies twice: 1 square metre is 10 000 square centimetres, so 100 / 10 000 = 0.01.

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.

Ask first whether the figure is a length or an area. Lengths convert by 100, while areas convert by 100 twice, that is 10 000. When one side is in metres and the other in centimetres, match the units before multiplying, convert both sides to the same unit before comparing, and always finish by checking the square unit in the answer.Tutor Registration →

Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.