A time is the moment the clock shows; a duration is how much has passed.
The short hand gives the hour and the long hand the minutes, and AM or PM shows where you are in the day.
A day is 24 hours, an hour is 60 minutes, and a calendar lays out weekdays, dates and weeks.
Here you move both hands to read a time, then add a duration to a start to see when it ends.
Let's Read the Clock!
⏰ A Clock Has Two Hands!
①Short hand (hour) tells the hour
②Long hand (minute) tells the minute
③Long hand on 12 = on the hour
Clock Reading Practice
9
30
seegongsik.com
Showing time on an analog clock with hour and minute hands
💡 How to Read a Clock
①Number short hand points to = hour
②Long on 12 = o'clock (0 min)
③Long on 6 = 30 min (half)
Passing of Time
45 min
seegongsik.com
Showing the time after some elapsed time from a start
⌛ Time vs. Duration
①"Time" = the moment (what the clock shows)
②"Duration" = how much has passed
③Class starts at 8:30, lasts 45 min → ends at 9:15
Summary
Time Units
1 hour = 60 min
Hour hand moves 1 step while minute hand goes around
A Day
1 day = 24 hours = 1440 min
Hour hand goes around twice = 1 day
Calendar
1 week = 7 days, 1 year = 12 months = 365 days
Dates also repeat regularly
🎯 Remember!
①Short = hour, Long = minute
②1 hour = 60 min
③Time = the moment, Duration = how long
④1 day = 24 hours
⑤Calendars show day-of-week and date
Examples and Unit Test
Example 1
How many minutes are in 2 hours?
1
1 hour = 60 minutes.
2
2 hours = 60 min + 60 min = 120 min.
▸ 120 minutes
To convert hours to minutes, count 60 minutes per hour.
Example 2
Class starts at 8:30 and lasts 45 minutes. What time does it end?
1
Add the 45 minutes of duration to the start time 8:30.
2
30 min + 45 min = 75 min = 1 h 15 min. So 8:30 + 45 min = 9:15.
▸ 9:15
End time = start time + duration.
Unit Test
If the long hand points to 6 and the short hand is between 3 and 4, what time is it?