Understand the idea.
A clock time appears twice
A 12-hour clock shows the same clock time twice in one day. Use am for the half-day from midnight up to noon and pm for the half-day from noon up to midnight.
The letters give information that the clock digits alone do not. Breakfast at 7:30 am and dinner at 7:30 pm are 12 hours apart. Use the event’s stated part of the day to choose the correct label.
The two special times
The labels switch at noon and midnight. Noon is 12 pm; midnight is 12 am, the start of a new day. Just after 11:59 am comes 12:00 pm, even though the number 12 looks larger than 11.
For an important plan, write “noon” or “midnight” when you mean one of these exact times. Do not decide from darkness alone: am and pm follow the time of day, not whether the sun is visible.
| Time | Example |
|---|---|
| 7:00 am | Morning breakfast |
| 12:00 pm | Noon |
| 7:00 pm | Evening meal |
| 12:00 am | Midnight |
See the method in action.
Before school
Write 8:15 in the morning using am or pm.
Worked solution
- 1
Identify the part of the day.
The question says morning, which is after midnight and before noon.
- 2
Attach the correct label.
Morning times in this interval use am; the hour and minutes stay unchanged.
8:15 am.
An evening bus
A bus leaves at 6:40 after dinner. Add am or pm.
Worked solution
- 1
Use the given context.
The bus leaves in the evening after dinner, after noon and before midnight.
- 2
Attach the correct label.
Evening belongs to the pm half-day; no change to the clock digits is needed.
6:40 pm.
Try it yourself.
Check your understanding
Is 12 noon 12 am or 12 pm?
Show answer & reasoning
12 pm.
12 noon is 12 pm. The pm half-day begins at noon and lasts until midnight; 12 am means midnight.
Keep practising
6 worksheet questions · 7 marks
Read the questions online
- Write 9:20 in the morning using am or pm.1 mark
- Write 4:10 in the afternoon using am or pm.1 mark
- Write midnight using a 12-hour clock time.1 mark
- Write noon using a 12-hour clock time.1 mark
- Which happens first on the same day: 6:30 am or 6:30 pm?1 mark
- An evening meeting notice says “8:00”. Explain what is missing and improve it.2 marks
Read the worked solutions
Equivalent correct methods earn the corresponding marks. Include units where asked.
- Write 9:20 in the morning using am or pm.1 mark
Morning before noon uses am.
9:20 am. - Write 4:10 in the afternoon using am or pm.1 mark
Afternoon comes after noon.
4:10 pm. - Write midnight using a 12-hour clock time.1 mark
Midnight starts a new day and the am half of it.
12:00 am. - Write noon using a 12-hour clock time.1 mark
Noon begins the pm half of the day.
12:00 pm. - Which happens first on the same day: 6:30 am or 6:30 pm?1 mark
Morning is before evening.
6:30 am. - An evening meeting notice says “8:00”. Explain what is missing and improve it.2 marks
A clock time repeats twice each day; pm makes evening clear.
The part of the day is missing. Write 8:00 pm.
Curriculum reference & lesson scope
Australian Curriculum v9 / SA Curriculum Mathematics 2026
am/pm; unit conversions; start/finish/elapsed time.
Official curriculum source ↗