This document outlines learning outcomes and content for a primary 4 mathematics chapter on time. It covers telling time in seconds using a stopwatch, understanding and using the 24-hour clock to tell time, and solving word problems related to calculating durations of time and determining start/end times. Examples are provided to demonstrate telling time in seconds, converting between 12-hour and 24-hour time, and solving word problems that require adding or subtracting times. Reference pages in textbooks are listed for additional information on each topic.

1. Time Primary 4 Mathematics

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

3. 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 .

4. 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.

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

6. 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

7. 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

8. The 24-hour Clock

9. 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

10. 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.

11. 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.

12. 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.

13. 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.

14. 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