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##### Intros
###### Lessons
1. Introduction to Reading 24-Hour Clock Time:
2. What is 24-hour clock time?
3. Equivalent 24-hour times on the analog clock
4. Comparing 12-hour times and 24-hour times in a table
5. How to convert between 12-hour clock time (AM/PM) and 24-hour clock time
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##### Examples
###### Lessons
1. Converting AM/PM Time into 24-Hour Time
Write as 24-hour time instead of AM/PM time.
1. 9:56 AM
2. 6:18 AM
3. 1:35 PM
4. 4:27 PM
5. 12:01 AM
2. Converting 24-Hour Time into AM/PM Time
Write as AM/PM time instead of 24-hour time.
1. 05:40
2. 22:23
3. 18:05
4. 11:37
5. 00:51
3. Noon and Midnight are Special Exceptions for 24-Hour Time
1. How do you write noon and midnight in AM/PM time?
2. How do you write noon and midnight in 24-hour time?
3. What is the rule for all other time conversion (not noon or midnight) for AM and PM hours into 24-hour time?
4. 24-Hour Time - True False Questions
Read the descriptions of the time shown below. Write true (T) or false (F) for each description.

19:45

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##### Practice
###### Topic Notes

In this lesson, we will learn:

• 24-hour clock time is used instead of 12-hour clock time to avoid being confused about AM or PM
• There are 24 hours in a day, so instead of the hours being labelled 1-12 AM or 1-12 PM, we can label them from 1-24 instead.
• There are rules for converting between 12-hour clock time and 24-hour clock time (and vice versa)

Notes:

• Using 12-hour clock time can be confusing because you might not know if someone is telling you a time for AM or PM (ex. is it 6 o’clock in the morning or evening?)

• By using 24-hour clock time, we can avoid the confusion of not knowing AM/PM
• There are 24 hours in a day
• The previous days ends, and the new day starts at midnight (12:00 AM)
• The middle of the day is right at noon (12:00 PM)
• For 24-hour time, you say the hours directly from 00 until 24 (or back to 00)

• This table shows all the equivalent times for the 12-hour clock and 24-hour clock:

• When it goes to midnight (12AM), it becomes 24:00 which is the same as 00:00
• Do not use this table when doing the practice questions; only for checking

• To convert from AM/PM time (12-hour clock time) to 24-hour time:

• $\qquad$ 1. Minutes: stay the same
$\qquad$ 2. Hours:
$\qquad$ 3. Exceptions: 12AM = 00h, 12PM = 12h
• $\qquad$ 4. Minutes: stay the same
$\qquad$ 5. Hours
$\qquad$ 6. Exceptions: 00:00 = 12AM and 12:00 = 12PM