Time

1. Time Time Intervals (Counting Method) Timetables www.mathsrevision.com Minutes and Seconds Stopwatch Time Created by Mr.Lafferty Maths Dept

2. Starter Questions Q1. Calculate Q2. Round to 1 decimal place 2.354. Q3. How many minutes in 3hours www.mathsrevision.com Q4. The answer to the question is 180. What is the question. Created by Mr.Lafferty Maths Dept

3. Counting Method Learning Intention Success Criteria • We are learning the counting method to find the difference between two times including over night. • 1. Understand the counting method. • 2. Find time differences between two times, showing all working. www.mathsrevision.com Created by Mr.Lafferty Maths Dept

4. Counting Method When working out time difference we will use the Counting Method. This method will always work. Example : Find the time difference between 08 32 hrs and 22 07 hrs Hrs Mins nearest hour www.mathsrevision.com What’s left 28 hours 13 08 32 09 00 22 00 22 07 + 07 28 mins 13 hrs 7 mins 13 35 Created by Mr.Lafferty Maths Dept

5. But there are 60 minutes = 1hour 82 mins = 1hr 22mins Counting Method A bus leaves Kirkintilloch Main Street at 22 02 hrs and arrives in Aberdeen at 03 24 hrs. How long was the journey. nearest hour What’s left Hrs Mins hours www.mathsrevision.com 58 22 02 23 00 03 00 03 24 4 58 mins 4 hrs 24 mins + 24 5hrs 22mins 4 82 Created by Mr.Lafferty Maths Dept

6. Using Timetables Glasgow leave 0725 2125 Carlisle arrive 0854 2257 leave 0943 2354 Birmingham arrive 1148 0156 leave 1214 0234 Kingsbridge arrive 1642 0639 (a) Write in 12 hour time when morning bus left Carlisle. 9.43am (b) Write in 12 hour time when evening bus left Carlisle. 11.54pm

7. Time Now try TJ2b Ex 1 Ch3 (page 21) www.mathsrevision.com Created by Mr.Lafferty Maths Dept

8. Starter Questions www.mathsrevision.com Created by Mr.Lafferty Maths Dept

9. Using Timetables Glasgow leave 0725 2125 Carlisle arrive 0854 2257 leave 0943 2354 Birmingham arrive 1148 0156 leave 1214 0234 Kingsbridge arrive 1642 0639 (a) Write in 12 hour time when morning bus left Carlisle. 9.43am (b) Write in 12 hour time when evening bus left Carlisle. 11.54pm

10. But there are 60 minutes = 1hour 74 mins = 1hr 14mins Using Timetables Glasgow leave 0725 2125 Carlisle arrive 0854 2257 leave 0943 2343 Birmingham arrive 1148 0156 leave 1214 0234 Kingsbridge arrive 1642 0639 (c) How long did the evening journey take in total. nearest hour Hrs Mins What’s left hours 35 35 21 25 22 00 06 00 06 39 8 0 35 mins 8 hrs 39 mins 39 + 14 9hrs 14mins 8 74

11. Time Now try TJ2b Ex 2 Ch3 (page 23) www.mathsrevision.com Created by Mr.Lafferty Maths Dept

12. Starter Questions www.mathsrevision.com Created by Mr.Lafferty Maths Dept

13. Minutes and Secs Time Learning Intention Success Criteria • 1. Add and subtract minutes and seconds. • We are learning to add and subtract minutes and seconds. www.mathsrevision.com Created by Mr.Lafferty Maths Dept

14. Adding & Subtracting Time 60 secs = 1min To add and subtract time we must remember (a) Add 4 mins 30secs to 2 mins 25 mins Always layout in columns Mins Secs www.mathsrevision.com 4 30 2 25 + 6 55 Created by Mr.Lafferty Maths Dept

15. Adding & Subtracting Time 60 secs = 1min 80 secs =1min 20 secs To add and subtract time we must remember (a) Add 3 mins 35 secs to 9 mins 45 mins Always layout in columns Mins Secs www.mathsrevision.com 3 35 9 45 + =13min 20 secs 12 80 Created by Mr.Lafferty Maths Dept

16. Adding & Subtracting Time 60 secs = 1min To add and subtract time we must remember (a) Subtract 2 mins 35secs from 5 mins 40 mins Always layout in columns Mins Secs www.mathsrevision.com 3 1 5 40 - 2 35 3 05 Created by Mr.Lafferty Maths Dept

17. Adding & Subtracting Time 60 secs = 1min To add and subtract time we must remember (a) Subtract 3 mins 30secs from 7 mins 20 mins Always layout in columns Mins Secs www.mathsrevision.com 60 6 7 20 - 3 30 3 50 Created by Mr.Lafferty Maths Dept

18. Time Now try TJ2b Ex 3 Ch3 (page 25) www.mathsrevision.com Created by Mr.Lafferty Maths Dept

19. Level D Starter Questions Q1. Calculate Q2. Round to 1 decimal place 2.354 Q3. How many minutes in 1 hour www.mathsrevision.com Q4. The answer to the question is 10. What is the question. Created by Mr.Lafferty Maths Dept

20. Minutes and Secs Time Learning Intention Success Criteria • We are learning to work out accuracy to 1 and 2 decimal places. • 1. Round to 1 and 2 decimal places. www.mathsrevision.com Created by Mr.Lafferty Maths Dept

21. Time Minute & Seconds Rounding time to 1 or 2 decimal places is just the same as rounding any number. Example : Round the times to 1 and 2 decimals places (a) 4.573 secs 4.6 secs to 1 decimal place www.mathsrevision.com 4.57 secs to 2 decimal place (b) 52.455 secs 52.5 secs to 1 decimal place 52.46 secs to 2 decimal place Created by Mr.Lafferty Maths Dept

22. Time Minute & Seconds Note : In athletics the winner of a race corresponds to the smallest time. Example : In a race the times are as follows Mark 11.01 sec, Caitlin 10.05sec, Owen 10.03 sec, Amy 10.92 sec and Euan 10.73 sec. Work out who won the race and the order they came in. www.mathsrevision.com 1st Owen 10.03 sec 2nd Caitlin 10.05sec 4th Amy 10.92 sec 3rd Euan 10.73 sec 5th Mark 11.01 sec Created by Mr.Lafferty Maths Dept

23. Time Minute & Seconds Example : In a race Katrina beat Daniel by 0.53 sec. Daniel’s time was 10.46 secs. What was Katrina’s time ? Katrina won therefore her time will be 0.53 less. www.mathsrevision.com Created by Mr.Lafferty Maths Dept

24. Have you updated your Learning Log ? Time Now try TJ2b Ex 4 Ch3 (page 26) www.mathsrevision.com Created by Mr.Lafferty Maths Dept