The document discusses time and calendars. It explains how to tell time using both analog and digital clocks, how to add and subtract times, and how to convert between 12-hour and 24-hour time. It also discusses leap years on the calendar and the main time units like seconds, minutes, hours, days, weeks, months, years, decades, centuries and millennia. There are examples and practice problems provided about calculating times, converting between time formats, and identifying leap years.

1. TIME –
THE CALENDAR

2. TIME

3. ANALOGUE
Hands of the analogue clock

4. DIGITAL

5. FIVE O’CLOCK

6. “HALF PAST FIVE “ OR “FIVE – THIRTY”

7. SIX O’CLOCK

8. PROBLEMS
Display these times using analogue and
digital:
Half past ten Quarter past
one
Ten to eleven Three
O’clock

9. ADDING AND SUBTRACTING TIME
What is 2:45 + 1:10 ?
What is 2:45 + 1:20 ?
What is 4:10 - 1:05 ?
What is 4:10 - 1:35 ?

10. PROBLEMS
What is the time:
a) 20 minutes after 10.40 ?
b) 30 minutes before 8.40 ?
c) 10 minutes before 6.05 ?
d) 1.30 hours after 11.45 ?

11. 24 - HOUR CLOCK
Morning times
0001 – 11 59 am (Ante Meridian))
Afternoon / evening times

12. CONVERTING FROM 24 HOUR CLOCK TO AM / PM
Converting from 24 hour clock to AM / PM
0000 to 0059 0100 to 1159 1200 to 1259 1300 to 2359
add 12 hours
straight
conversion to
AM
straight
conversion to PM
subtract 12
hours
EXAMPLES:
0000 --> 12
midnight
0015 --> 12:15
AM
0030 --> 12:30
AM
0059 --> 12:59
AM
EXAMPLES:
0100 --> 01:00
AM
0300 --> 03:00
AM
0700 --> 07:00
AM
0830 --> 08:30
AM
1000 --> 10:00
EXAMPLES:
1200 --> 12 noon
1215 --> 12:15
PM
1230 --> 12:30
PM
1259 --> 12:59
PM
EXAMPLES:
1300 --> 01:00
PM
1500 --> 03:00
PM
1800 --> 06:00
PM
2030 --> 08:30
PM
2215 --> 10:15

13. PROBLEMS
Change these 24-hour clock times to am/pm
time:
0945 1500 0430
1650 2020 0815
2330 1215 0020

14. PROBLEMS
Write these times using the 24-hour
clock:
1. Half past seven in the morning
2. Twenty to nine at night
3. Five to four in the afternoon
4. Quarter to four in the morning
5. Ten past eight at night
6. Twenty five past two in the

15. THE CALENDAR

16. LEAP YEARS

17. PROBLEMS
Which of these are leap
years?
2004 1967
1942 1900
2100 2000

18. MAIN TIME UNITS
1 second 1 week = 7 days 1 decade = 10years
1 minute = 60
seconds
1 month 1 century = 100
years
1 hour = 60 minutes 1 year 1 millennium = 1000
years
1 day = 24 hours

19. PROBLEMS
How many minutes are there in 3 hours?
How many hours are there in 2 days?
How many minutes are there in half an
hour?
How many months are there in 4 years?
How many decades are there in a