How is this paper different from the first three?

This is a redo paper focused on the commonest errors of a wrong multiplier or a misplaced decimal point.

How many items are in this paper?

Ten: three basic, three intermediate, three challenge and one redo item.

How long should it take?

About 20 to 30 minutes; finish under timing before checking.

Are these past public examination questions?

No. All items are original and are not past papers or official marking schemes.

Which level is it for?

P5, for revising unit conversion and school tests.

P5 Maths Unit Conversion Paper 4: Error Review

2026-11-09

Tutor Prep Guide · P5 Maths

Ten original items targeting wrong multipliers and misplaced decimal points.

Direct answers　Questions 1-3 redo the basic conversions, 4-6 cover compound units and decimals, 7-9 are two-step applications, and question 10 redoes the kilometre-to-metre slip. Time yourself first, then check each answer.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10
Suggested time	30
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: P5 Maths: Unit Conversion
Level	P5

02　Questions (10 items)

FoundationHow many centimetres are there in 4.6 metres? (Common error: 46 cm)
FoundationHow many litres are there in 3500 millilitres? (Common error: 0.35 L)
FoundationHow many grams are there in 8 kilograms? (Common error: 800 g)
IntermediateHow many metres are there in 2 km 300 m?
IntermediateHow many grams are there in 1.05 kg? (Common error: 150 g)
IntermediateHow many centimetres are there in 7 m 5 cm? (Common error: 750 cm)
ChallengeSubtract 750 mL from 2.5 L. Give the answer in millilitres.
ChallengeAdd 450 kg to 1.2 tonnes. Give the answer in kilograms.
Challenge3 km is divided into 8 equal parts. How many metres in each part?
Error redoHow many metres are there in 6.4 km? (Redo: 640 m was the earlier mistake)

03　Answers and one-line notes

#	Answer	One-line note
1	460 cm	1 m = 100 cm, so 4.6 x 100 = 460 cm; the decimal point moves two places right.
2	3.5 L	1000 mL = 1 L, so 3500 / 1000 = 3.5 L.
3	8000 g	1 kg = 1000 g, so 8 x 1000 = 8000 g.
4	2300 m	2 x 1000 = 2000, then add 300 to get 2300 m.
5	1050 g	1 kg = 1000 g, so 1.05 x 1000 = 1050 g; the 5 in the hundredths place is 50 g.
6	705 cm	7 x 100 = 700, then add 5 cm to get 705 cm; 5 cm is not 50 cm.
7	1750 mL	2.5 L = 2500 mL, and 2500 – 750 = 1750 mL.
8	1650 kg	1.2 tonnes = 1200 kg, and 1200 + 450 = 1650 kg.
9	375 m	3 km = 3000 m, and 3000 / 8 = 375 m.
10	6400 m	1 km = 1000 m, so 6.4 x 1000 = 6400 m; multiplying by 100 gives the wrong 640 m.

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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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.