AC9M5M03 • Year 5 Maths
compare 12- and 24-hour time systems and solve practical problems involving the conversion between them
Students convert times around noon and midnight, read schedules and calculate elapsed time using timelines while distinguishing a clock time from a duration.
In 24-hour time, hours after noon continue 13–23; midnight begins 00:00 and noon is 12:00.
For pm times after 12:59, add 12 to the hour. For 13:00–23:59, subtract 12 and label pm.
Do not subtract time digits as ordinary decimals. Bridge through whole hours and check whether the interval crosses noon or midnight.
Learning routine: Represent → Reason → Calculate → Interpret → Verify
For pm times after 12:59, add 12 to the hour. For 13:00–23:59, subtract 12 and label pm.
Do not subtract time digits as ordinary decimals. Bridge through whole hours and check whether the interval crosses noon or midnight.
Now transfer the same relationship to a new situation and justify the result with precise vocabulary.
Content description: compare 12- and 24-hour time systems and solve practical problems involving the conversion between them.
Represent 12-hour and 24-hour time and label the relationship or measurement being used.
Compare two valid methods or tools and justify which better suits the numbers, attribute or purpose.
Apply the concept to an unfamiliar example, state units or conditions and verify independently.
Core idea: In 24-hour time, hours after noon continue 13–23; midnight begins 00:00 and noon is 12:00.
Learn from the Topic Guide and fixed Teacher Slides, complete the Practice Sheet, use Practice for supported feedback, then take the Test when ready.
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Before you watch:
Periwinkle — Read 24-hour times and compare them with morning and afternoon 12-hour times.
As you watch: Why is 15:30 an afternoon time, and what is its 12-hour equivalent?
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Try it: Convert 07:45, 13:20 and 22:05 to 12-hour time; then write 6:15 pm in 24-hour form.
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Mapped skill: compare 12- and 24-hour time systems and solve practical problems involving the conversion between them
These references identify matching or closely related learning. Curriculum sequence, terminology and depth vary, so teachers should use the mapped skill and lesson difficulty to confirm suitability.
| Region | Curriculum framework | Closest level or code |
|---|---|---|
| Australia | Australian Curriculum v9.0 | AC9M5M03 · Year 5 |
| Victoria | Victorian Curriculum F–10 Version 2.0 — Mathematics | VC2M5M03 · Level 5 |
| New South Wales | NSW Mathematics K–10 Syllabus (2022) | MA3-NSM-02 · Stage 3 |
| United States (USA) | Common Core State Standards for Mathematics | Grade 5 |
| Canada (Ontario) | Ontario Curriculum — Mathematics | Grade 5 |
| United Kingdom (England) | National Curriculum in England — Mathematics | Year 6, Key Stage 2 |
| India | NCERT / CBSE — Mathematics | Class 5 |
Australian Curriculum v9.0 is the canonical source for this SkillrHub lesson. Victoria and NSW entries name the closest published state codes or outcomes; international entries are planning references rather than claims of identical curricula.
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Topic reference: AC9M5M03 — AC9M5M03: Compare 12- and 24-hour time systems and solve practical problems involving the conversion between them
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