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# Time

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lesson ppt on Math topic Time Pri 4

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### Time

1. 1. Time Primary 4 Mathematics
2. 2. Chapter Learning Outcomes <ul><li>Telling time in seconds </li></ul><ul><li>Understanding and using the 24-hour clock </li></ul><ul><li>Solve word problems related to time </li></ul>
3. 3. Time In Seconds <ul><li>There are three hands on this clock. </li></ul>This is the hour hand. This is the minute hand. This is the second hand .
4. 4. Time In Seconds <ul><li>Use a stopwatch to see what you can do in 1 second! </li></ul>I can recall that 1 hour = 60 minutes . Well, 1 minute = 60 seconds ! We use s to stand for seconds.
5. 5. Time In Seconds 3.00 p.m. 3.01 p.m. after 30 s after 30 s
6. 6. The 24-hour Clock <ul><li>What is the time shown on the clock? </li></ul>9.30 a.m. Nine thirty a.m. Using 12-hour clock 09 30 Zero nine thirty hours Using 24-hour clock
7. 7. The 24-hour Clock <ul><li>What is the time shown on the clock? </li></ul>10.00 p.m. Ten p.m. Using 12-hour clock 22 00 Twenty-two hundred hours Using 24-hour clock
8. 8. The 24-hour Clock
9. 9. Example <ul><li>Fill in the blanks. </li></ul>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. 10. Word Problems <ul><li>Arianne started reading the newspaper at 18 00. She finished reading at 19 20. How long did she take to read the newspaper? </li></ul>She took 1 h 20 min. I can solve this using a time line.
11. 11. Word Problems <ul><li>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? </li></ul>He started cooking at 11 35. Count backwards on the time line.
12. 12. Example <ul><li>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? </li></ul>He left Melbourne at 19 45 on Monday.
13. 13. Example <ul><li>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? </li></ul>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. 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