How is this error-review paper different from the first three?

It targets four slips: treating an hour as a hundred minutes, mixing minutes with seconds, forgetting to carry at sixty, and subtracting times the wrong way.

What is a safe routine for time intervals?

Convert everything to minutes first, then write the answer back in hours and minutes; for clock times use the 24-hour form before subtracting.

P3 Maths Time and Time Intervals Paper 4: Error Review

2026-11-09

Tutor Prep Guide · P3 Maths

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

Direct answers　Items 1-3 revisit the factor of 60 between hours, minutes and seconds, 4-6 practise the direction of time intervals, 7-9 cover finishing times, morning-to-afternoon spans and lessons with breaks, and item 10 unpicks treating an hour as 100 minutes. Cover the answers first, then check each 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: P3 Maths Time and Time Intervals
Level	P3

02　Questions (10 items)

FoundationError review: how many minutes are there in 1 hour?
FoundationError review: how many minutes are there in 3 hours 20 minutes?
FoundationError review: how many seconds are there in 2 minutes 45 seconds?
IntermediateError review: how long is it from 9:45 a.m. to 11:10 a.m.?
IntermediateError review: write 150 seconds in minutes and seconds.
IntermediateError review: how long is it from 14:50 to 16:05?
ChallengeError review: a film lasts 1 hour 50 minutes and starts at 18:40. When does it end?
ChallengeError review: how long is it from 8:15 a.m. to 3:40 p.m.?
ChallengeError review: four 40-minute lessons with a 10-minute break between them start at 8:00. When do they finish?
Error redoError review: a pupil writes 1 hour 20 minutes = 120 minutes. What is wrong and what is correct?

03　Answers and one-line notes

#	Answer	One-line note
1	60 minutes	1 hour = 60 minutes; 100 minutes borrows the factor of 100 used between metres and centimetres.
2	200 minutes	3 x 60 + 20 = 200; 320 comes from treating 1 hour as 100 minutes.
3	165 seconds	2 x 60 + 45 = 165; 245 comes from treating 1 minute as 100 seconds.
4	1 hour 25 minutes	9:45 to 10:45 is one hour and 25 more minutes reach 11:10, so 1 hour 25 minutes; 35 minutes comes from subtracting the minutes the wrong way.
5	2 minutes 30 seconds	150 divided by 60 is 2 remainder 30, so 2 minutes 30 seconds; 1 minute 50 seconds treats a minute as 100 seconds.
6	1 hour 15 minutes	14:50 to 15:50 is one hour and 15 more minutes reach 16:05, so 1 hour 15 minutes.
7	20:30	18:40 plus one hour is 19:40, then 50 minutes gives 20:30; 19:90 forgets to carry at 60 minutes.
8	7 hours 25 minutes	In 24-hour time this is 08:15 to 15:40, a gap of 445 minutes, i.e. 7 hours 25 minutes.
9	11:10	4 x 40 + 3 x 10 = 190 minutes, i.e. 3 hours 10 minutes after 8:00, giving 11:10; ignoring the three breaks ends too early.
10	80 minutes	An hour is 60 minutes, not 100, so 60 + 20 = 80; treating hours as hundreds is the root of this slip.

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.