3. TimeTime
Time In SecondsTime In Seconds
There are three hands on this clock.
3
This is the hour hand.
This is the minute hand.
This is the second
hand.
4. TimeTime
Time In SecondsTime In Seconds
Use a stopwatch to
see what you can
do in 1 second!
4
I can recall that 1 hour = 60 minutes.
Well, 1 minute = 60 seconds!
We use s to stand for seconds.
6. TimeTime
The 24-hour ClockThe 24-hour Clock
What is the time shown on the clock?
6
9.30 a.m.
Nine thirty a.m.
Using 12-hour clock
09 30
Zero nine thirty hours
Using 24-hour clock
7. TimeTime
The 24-hour ClockThe 24-hour Clock
7
What is the time shown on the clock?
10.00 p.m.
Ten p.m.
Using 12-hour clock
22 00
Twenty-two hundred
hours
Using 24-hour clock
10. TimeTime
Word ProblemsWord Problems
Arianne started reading the newspaper at 18 00.
She finished reading at 19 20. How long did she
take to read the newspaper?
10
I can solve this using a time line.
She took 1 h 20 min.
11. TimeTime
Word ProblemsWord Problems
Justin finished cooking his lunch at 13 45. He took
2 h 10 min to cook. At what time did he start
cooking his lunch?
11
He started cooking at 11 35.
Count backwards on the time line.
12. TimeTime
ExampleExample
Andy took a flight from Melbourne to Singapore which
lasted 9 h 30 min. He stopped in transit for 2 h before
taking a connecting flight to Penang for 1 h 15 min. If he
landed at 08 30 on Tuesday, when did he leave
Melbourne?
12
He left Melbourne at 19 45 on Monday.
13. TimeTime
ExampleExample
Jermaine started watching a movie marathon at
19 30. He finished watching the movies at 02
45 the following day. How long was the movie
marathon?
13
4 h 30 min + 2 h 45 min = 6 h 75 min = 7 h 15 min
The movie marathon lasted 7 h 15 min.
14. TimeTime
14
Reference -Reference - TextbooksTextbooks
Learning Outcomes
Telling time in seconds 4B Pg 81 – 85 4B Pg 64 – 67
Understanding and using the 24-
hour clock
4B Pg 86 – 89 4B Pg 68 – 71
Solve word problems related to
time
4B Pg 89 – 97 4B Pg 72 – 76