Measuring Time
Learning Goals
• To measure time, we start counting units of time
when the activity begins and stop counting when
the activity ends.
• The second is a small unit of time. It usually takes
several seconds to measure the duration of an
activity.
• Time can be shown using 12-h or 24-h notation.
• Four digits are used to write time in 24-h
notation.
• Many analog clocks show time in hours, minutes,
and seconds.
• This clock shows a time of 10 hours, 10 minutes
and 25 seconds.
• We write 10h 10 min 25 s
• In SI notation, we write: 10:10:25
• SI Notation in time is telling time to the hour,
second and minute (example 03:45:02) .
In date it tells the year month and day (example
2009 07 25).
What is the SI notation for the
following Analog Clocks
What is the SI notation for the
following Dates
What time is shown on this watch?
• Is it morning or afternoon?
• How do we show morning and
afternoon when we write
down times?
• Have you seen time written a
different way?
Converting 24-hr to 12-hr
24 hr
13:55
19:37
22:56
00:01
08:30
11:15
12 hr
Lesson 2: The 24-Hour Clock
1. a) Oscar arrived at the library at 09:15 and left at 13:10. How long
did Oscar spend in the library?
b) Ani’s plane departs at 22:45 and lands at 08:10.
How long was the flight?
Homework
• Gr6 – pg 211; q’s 1-5