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MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
TimeTime
Revision MNU 1-10a
Counting Method
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Stopwatch Time
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
Starter QuestionsStarter Questionsw
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.com 75% of £ 200Q1. 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 thequestion.
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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2.2. Change from 24 to 12 Change from 24 to 12 hour clock.hour clock.
1. To revise previous work on converting between 12 and 24 hr clock and vice versa.
Revision
1.1. Change from 12 to 24 Change from 12 to 24 hour clock.hour clock.
Converting TimeConverting Time
10 Apr 2023 Created by Mr.Lafferty Maths Dept
2300220021002000190
018001700160015001400
1300
1200
11 pm
10 pm
9 pm8 pm7
pm6 pm5 pm4 pm3 pm2 pm
1 pm
midday
1100100009000800070
006000500040003000200
0100
0000
11 am
10 am
9 am8 am7 am6 am5am4 am3 am2 am1
ammidnigh
t
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
10 Apr 2023 Created by Mr.Lafferty Maths Dept
2300220021002000190
018001700160015001400
1300
1200
11 pm
10 pm
9 pm8 pm7
pm6 pm5 pm4 pm3 pm2 pm
1 pm
midday
1100100009000800070
006000500040003000200
0100
0000
11 am
10 am
9 am8 am7 am6 am5am4 am3 am2 am1
ammidnigh
t
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
MNU 2-10aMNU 2-10b
greater than 12 subtract 12
Let’s make up our own questions !
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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Converting TimeConverting 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
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
Now try Exercise 1Ch3 (page 43)
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TimeTimeRevision
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
Starter QuestionsStarter Questionsw
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o o
2. What kind of angle is this
3. 56.98 10
4. Name the angle that is between 180 and 360
1. Calculate 14 x 100
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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2.2. Find time differences Find time differences between two times, between two times, showing all working.showing all working.
1. We are learning the counting method to find the difference between two times.
1.1. Understand the counting Understand the counting method.method...
Counting Counting MethodMethod
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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Counting Counting MethodMethod
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 40 11 00 11 10
Hrs Mins
20
210
2 30
nearest hour What’s left
+09 00
hours
20 mins 2 hrs 10 mins
MNU 2-10aMNU 2-10b
A bus leaves Kirkintilloch Main Street at 14 40 hrsand arrives in Aberdeen at 18 50 hrs. How long was the journey.
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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Counting Counting MethodMethod
14 40 18 00 18 50
Hrs Mins
20
350
3 70
nearest hour What’s left
+
15 00
hours
20 mins 3 hrs 50 mins
But there are 60 minutes =
1hour
70 mins = 1hr 10mins
4hrs 10 mins
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
014
Hrs Mins
49+
08 25 09 00 09 14
nearest hour What’s left
09 00
hours
35 mins 0 hrs 14 mins
350
14
MNU 2-10aMNU 2-10b
Let’s make up our own question !The key steps are left on the slide to help you.
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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Counting Counting MethodMethod
Hrs Minsnearest
hour What’s left
+
hours
mins hrs mins
But there are 60 minutes =
1hour
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
Now try Exercise 2Ch3 (page 44)
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Counting Counting MethodMethod
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
Starter QuestionsStarter Questionsw
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o o
2. What kind of angle is this
3. 1.268 100
4. Name the angle that is between 0 and 90
1. Calculate 41.9 x 100
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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1. We are learning to work out accuracy to 1 and 2 decimal places.
1.1. Round to 1 and 2 decimal Round to 1 and 2 decimal places.places.
TimeTimeMinutes and Secs
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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TimeTimeMinute & 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
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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TimeTimeMinute & Seconds
Note : In athletics the winner of a race corresponds tothe 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. 1st Owen 10.03 sec
2nd Caitlin 10.05sec
3rd Euan 10.73 sec
4th Amy 10.92 sec
5th Mark 11.01 sec
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Deptww
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TimeTimeMinute & 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.
0 9 1 1 0. 46
- 0. 53
9. 93
MNU 2-10aMNU 2-10b
10 Apr 202310 Apr 2023 Created by Mr.Lafferty Maths DeptCreated by Mr.Lafferty Maths Dept
Now try Exercise 3Ch3 (page 46)
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TimeTimeMinute & Seconds