Numeracy Worksheet - Castlebrae Community High School - 2012 Page 23
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47FHS Numeracy
contents page
Time
It is essential to know the number of months, weeks and days
in a year, and the number of days in each month.
Time may be expressed in 12 or 24 hour notation.
12-hour clock
Time can be displayed on a clock face, or digital clock.
These clocks both show fifteen
minutes past five, or quarter past
five.
When writing times in 12 hour clock, we need to add a.m. or p.m. after the time.
a.m.
is used for times between midnight and 12 noon (morning)
p.m.
is used for times between 12 noon and midnight (afternoon / evening).
5.15 am or 5.15pm?
24-hour clock
In the 24 hour clock, the hour is written as a 2 digit number
between 00 and 24. Midnight is expressed as 00 00, or 24 00.
After 12 noon, the hours are numbered 13, 14, 15 … etc.
Examples
Level 2
12 hr
24 hr
9.55 am
09 55 hours
3.35 pm
15 35 hours
12.20 am
00 20 hours
2.16 am
02 16 hours
8.45 pm
20 45 hours
23
L Watson 2012
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