Time

Time Primary 4 Mathematics

Chapter Learning Outcomes
Telling time in seconds
Understanding and using the 24-hour clock
Solve word problems related to time

Time In Seconds
There are three hands on this clock.
This is the hour hand. This is the minute hand. This is the second hand .

Time In Seconds
Use a stopwatch to see what you can do in 1 second!
I can recall that 1 hour = 60 minutes . Well, 1 minute = 60 seconds ! We use s to stand for seconds.

Time In Seconds 3.00 p.m. 3.01 p.m. after 30 s after 30 s

The 24-hour Clock
What is the time shown on the clock?
9.30 a.m. Nine thirty a.m. Using 12-hour clock 09 30 Zero nine thirty hours Using 24-hour clock

The 24-hour Clock
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

The 24-hour Clock

Example
Fill in the blanks.
04 30 5.20 p.m. 15 15 2.05 a.m. 12 00 9.55 p.m. 12 40 5.05 a.m. 12-hour clock 24-hour clock 4.30 a.m. 17 20 3.15 p.m. 02 05 Noon 21 55 12.40 p.m. 05 05

Word Problems
Arianne started reading the newspaper at 18 00. She finished reading at 19 20. How long did she take to read the newspaper?
She took 1 h 20 min. I can solve this using a time line.

Word 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?
He started cooking at 11 35. Count backwards on the time line.

Example
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?
He left Melbourne at 19 45 on Monday.

Example
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?
4 h 30 min + 2 h 45 min = 6 h 75 min = 7 h 15 min The movie marathon lasted 7 h 15 min.

Reference - Textbooks 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

Time

by pangwanching on Aug 15, 2010

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Time — Presentation Transcript