Use a.m. and p.m.

The learner understands that the 12-hour clock repeats each clock time twice in a day: a.m. identifies times from midnight through the morning before noon, while p.m. identifies times from noon through the evening before midnight. They distinguish noon (12:00 p.m.) from midnight (12:00 a.m.) and use these labels to interpret schedules and sequence events; 24-hour time, time zones, and more advanced time conversions are not included.

Detailed Explanation: Use a.m. and p.m.

The 12-hour clock repeats the same clock numbers twice each day.

a.m. means the time from midnight through the morning before noon.
p.m. means the time from noon through the evening before midnight.
Midnight is $12{:}00$ a.m.
Noon is $12{:}00$ p.m.

Example

A family’s schedule says:

Wake up at $7{:}00$
Eat lunch at $12{:}00$
Play soccer at $4{:}30$
Go to bed at $9{:}00$

Write each time with a.m. or p.m.

Step 1: Label the morning time.
Waking up at $7{:}00$ happens before noon, so it is:

7{:}00\text{ a.m.}

Step 2: Label noon.
Lunch is at noon. Noon is always $12{:}00$ p.m., so it is:

12{:}00\text{ p.m.}

Step 3: Label the afternoon time.
Soccer at $4{:}30$ happens after noon, so it is:

4{:}30\text{ p.m.}

Step 4: Label the evening time.
Bedtime at $9{:}00$ happens after noon and before midnight, so it is:

9{:}00\text{ p.m.}

The completed schedule is:

7{:}00\text{ a.m.},\quad 12{:}00\text{ p.m.},\quad 4{:}30\text{ p.m.},\quad 9{:}00\text{ p.m.}

Remember: 12:00 a.m. is midnight, and 12:00 p.m. is noon.

Learn by doing: Use a.m. and p.m.

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Time - Approximate - Event to AM/PM

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