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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Time Revision MNU 1-10a Counting Method www.mathsrevision.com Stopwatch Time

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Starter Questions www.mathsrevision.com Q1.Calculate Q2.Round to 1 decimal place 2.354. Q3. How many minutes in 3hours Q4.The answer to the question is 180. What is the question.

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Learning Intention Success Criteria 2.Change from 24 to 12 hour clock. 1.To revise previous work on converting between 12 and 24 hr clock and vice versa. Revision 1.Change from 12 to 24 hour clock. Converting Time

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2-Jun-14Created by Mr.Lafferty Maths Dept 230022002100200019001800170016001500140013001200 11 pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday 110010000900080007000600050004000300020001000000 11 am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12/24 Hour Clock To go from 12 hour clock to 24 hour clock just add 12 to the pm hours: 2000 2100 1830 2330 1620 Examples 8 pm becomes 9 pm becomes 6:30 pm becomes 11:30 pm becomes 4:20 pm becomes 3:10 pm becomes 1510

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2-Jun-14Created by Mr.Lafferty Maths Dept 230022002100200019001800170016001500140013001200 11 pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday 110010000900080007000600050004000300020001000000 11 am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12/24 Hour Clock To go from 24 hour clock to 12 hour clock just subtract 12 from the hours if it is greater than 12: 8 pm 9 pm 5:30 pm 10:08 pm 8:06 pm Examples 2000 becomes 2100 becomes 1730 becomes 2208 becomes 2006 becomes 1350 becomes 1:50 pm

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MNU 2-10a MNU 2-10b greater than 12 subtract 12 Lets make up our own questions ! 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Converting Time Key Points 12 hour clock Analogue clock ALWAYS use AM or PM 24 hour clock Digital clock NEVER use AM or PM pm times add on 12 ALWAYS 4 digits Hours 0 - 24 Hours 1 - 12

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Now try Exercise 1 Ch3 (page 43) www.mathsrevision.com Time Revision

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Starter Questions Starter Questions www.mathsrevision.com

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Learning Intention Success Criteria 2.Find time differences between two times, showing all working. 1.We are learning the counting method to find the difference between two times. 1.Understand the counting method.. Counting Method

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com 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 40 hrs and 11 10 hrs 08 4011 0011 10 HrsMins 20 2 10 230 nearest hour Whats left + 09 00 hours 20 mins2 hrs10 mins

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MNU 2-10a MNU 2-10b A bus leaves Kirkintilloch Main Street at 14 40 hrs and arrives in Aberdeen at 18 50 hrs. How long was the journey. 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Counting Method 14 4018 0018 50 HrsMins 20 3 50 370 nearest hour Whats left + 15 00 hours 20 mins3 hrs50 mins But there are 60 minutes = 1hour 70 mins = 1hr 10mins 4hrs 10 mins

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Using Timetables 2314 2302 2254 2248 2243 2237 2225 2214 2202 2154 2148 2143 2137 2125 2114 2102 2054 2048 2043 2037 2025 Until Hour Every And 1114 1102 1054 1048 1043 1037 1025 1014 1002 0954 0948 0943 0937 0925 0914 0902 0854 0848 0843 0837 0825 Glasgow Bus Station George Square Port Dundas Springburn Milton Bishopbriggs Kirkie Bus Station * * * How long does the first bus take from Kirkie to Glasgow. 35 0 14 HrsMins 49 + 08 2509 0009 14 nearest hour Whats left 09 00 hours 35 mins0 hrs14 mins 35 0 14

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MNU 2-10a MNU 2-10b Lets make up our own question ! The key steps are left on the slide to help you. 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Counting Method HrsMins nearest hour Whats left + hours mins hrs mins But there are 60 minutes = 1hour

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Now try Exercise 2 Ch3 (page 44) www.mathsrevision.com Counting Method

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Starter Questions Starter Questions www.mathsrevision.com

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Learning Intention Success Criteria 1.We are learning to work out accuracy to 1 and 2 decimal places. 1.Round to 1 and 2 decimal places. Time Minutes and Secs

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com 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 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

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com 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. 1 st Owen 10.03 sec 2 nd Caitlin 10.05sec 3 rd Euan 10.73 sec 4 th Amy 10.92 sec 5 th Mark 11.01 sec

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept www.mathsrevision.com Time Minute & Seconds Example : In a race Katrina beat Daniel by 0.53 sec. Daniels time was 10.46 secs. What was Katrinas time ? Katrina won therefore her time will be 0.53 less.

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MNU 2-10a MNU 2-10b 2-Jun-14Created by Mr.Lafferty Maths Dept Now try Exercise 3 Ch3 (page 46) www.mathsrevision.com Time Minute & Seconds

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