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5-Sep-14Created by Mr.Lafferty Maths Dept Time Converting 12hour to 24 hour clock Counting Method www.mathsrevision.com Adding / Subtracting Time Level.

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Presentation on theme: "5-Sep-14Created by Mr.Lafferty Maths Dept Time Converting 12hour to 24 hour clock Counting Method www.mathsrevision.com Adding / Subtracting Time Level."— Presentation transcript:

1 5-Sep-14Created by Mr.Lafferty Maths Dept Time Converting 12hour to 24 hour clock Counting Method Adding / Subtracting Time Level D

2 5-Sep-14Created by Mr.Lafferty Maths Dept Starter Questions Level D Q1.Calculate Q2.Round to 1 decimal place Q3. How many minutes in 1 hour Q4.The answer to the question is 10. What is the question.

3 5-Sep-14Created by Mr.Lafferty Maths Dept Learning Intention Success Criteria 2.Change from 24 to 12 hour clock. 1.To explain how to convert between 12 and 24 hour clock and vice versa. Revision Level D 1.Change from 12 to 24 hour clock. Converting Time Level D

4 5-Sep-14Created by Mr.Lafferty Maths Dept pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12Hour to 24 Hour Clock To go from 12 hour clock to 24 hour clock just add 12 to the pm hours: Examples 8 pm becomes 9 pm becomes 6:30 pm becomes 11:30 pm becomes 4:20 pm becomes 3:10 pm becomes 1510

5 5-Sep-14Created by Mr.Lafferty Maths Dept pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 24 Hour to 12 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

6 greater than 12 subtract 12 Let’s make up our own questions ! 5-Sep-14Created by Mr.Lafferty Maths Dept Level D 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 Hours

7 5-Sep-14Created by Mr.Lafferty Maths Dept Now try Exercise 1 Ch4 (page 45) Time Level D

8 5-Sep-14Created by Mr.Lafferty Maths Dept Starter Questions Starter Questions Level D P Q R

9 5-Sep-14Created by Mr.Lafferty Maths Dept Learning Intention Success Criteria 2.Find time differences between two times, showing all working. 1.To explain the counting method to find the difference between two times. 1.Understand the counting method. Counting Method Level D

10 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Counting Method When working out time difference we will use the Counting Method. This method will always work. Example : Find the time difference between hrs and hrs HrsMins nearest hour What’s left hours 20 mins2 hrs10 mins

11 A bus leaves Kirkintilloch Main Street at hrs and arrives in Aberdeen at hrs. How long was the journey. 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Counting Method HrsMins nearest hour What’s left hours 20 mins3 hrs50 mins But there are 60 minutes = 1hour 70 mins = 1hr 10mins 4hrs 10 mins

12 Using Timetables Until Hour Every And Glasgow Bus Station George Square Port Dundas Springburn Milton Bishopbriggs Kirkie Bus Station * * * How long does the first bus take from Kirkie to Glasgow HrsMins nearest hour What’s left hours 35 mins0 hrs14 mins

13 Let’s make up our own question ! The key steps are left on the slide to help you. 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Counting Method HrsMins nearest hour What’s left + hours mins hrs mins But there are 60 minutes = 1hour

14 5-Sep-14Created by Mr.Lafferty Maths Dept Now try Exercise 2 Ch4 (page 47) Level D Counting Method

15 5-Sep-14Created by Mr.Lafferty Maths Dept Starter Questions Starter Questions Level D

16 5-Sep-14Created by Mr.Lafferty Maths Dept Learning Intention Success Criteria 1.To explain how round to the nearest second and also add and subtract minutes and seconds. 1.Round to the nearest second. Time Minutes and Secs Level D 2.Add and subtract minutes and seconds.

17 5-Sep-14Created by Mr.Lafferty Maths Dept Time Minute & Seconds Level D 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) secs 52.5 secs to 1 decimal place secs to 2 decimal place

18 To add and subtract time we must remember 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Adding & Subtracting Time MinsSecs + 60 secs = 1min (a) Add 4 mins 30secs to 2 mins 25 mins Always layout in columns

19 To add and subtract time we must remember 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Adding & Subtracting Time MinsSecs + 60 secs = 1min (a) Add 3 mins 35 secs to 9 mins 45 mins Always layout in columns secs =1min 20 secs =13min 20 secs

20 To add and subtract time we must remember 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Adding & Subtracting Time MinsSecs - 60 secs = 1min (a) Subtract 2 mins 35secs from 5 mins 40 mins Always layout in columns

21 To add and subtract time we must remember 5-Sep-14Created by Mr.Lafferty Maths Dept Level D Adding & Subtracting Time MinsSecs - 60 secs = 1min (a) Subtract 3 mins 30secs from 7 mins 20 mins Always layout in columns

22 5-Sep-14Created by Mr.Lafferty Maths Dept Now try Exercise 3 Ch4 (page 49) Time Minute & Seconds Level D


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