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Level D. Time. Converting 12hour to 24 hour clock. Counting Method. www.mathsrevision.com. Adding / Subtracting Time. Level D. Starter Questions. Q1. Calculate. Q2. Round to 1 decimal place 2.354. Q3. How many minutes in 1 hour. www.mathsrevision.com.

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slide1

Level D

Time

Converting 12hour to 24 hour clock

Counting Method

www.mathsrevision.com

Adding / Subtracting Time

Created by Mr.Lafferty Maths Dept

starter questions

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

converting time

Level D

Revision Level D

Converting Time

Learning Intention

Success Criteria

  • To explain how to convert between 12 and 24 hour clock and vice versa.
  • Change from 12 to 24 hour clock.
  • 2. Change from 24 to 12 hour clock.

www.mathsrevision.com

Created by Mr.Lafferty Maths Dept

slide4

12Hour to 24 Hour Clock

midnight

1 am

2 am

3 am

4 am

5am

6 am

7 am

8 am

9 am

10 am

11 am

0000

0100

0200

0300

0400

0500

0600

0700

0800

0900

1000

1100

midday

1 pm

2 pm

3 pm

4 pm

5 pm

6 pm

7 pm

8 pm

9 pm

10 pm

11 pm

1200

1300

1400

1500

1600

1700

1800

1900

2000

2100

2200

2300

Examples

9 pm becomes

8 pm becomes

6:30 pm becomes

11:30 pm becomes

4:20 pm becomes

3:10 pm becomes

To go from 12 hour clock to 24 hour clock just add 12 to the pm hours:

2100

2000

1830

2330

1620

1510

Created by Mr.Lafferty Maths Dept

slide5

24 Hour to 12 Hour Clock

midnight

1 am

2 am

3 am

4 am

5am

6 am

7 am

8 am

9 am

10 am

11 am

0000

0100

0200

0300

0400

0500

0600

0700

0800

0900

1000

1100

midday

1 pm

2 pm

3 pm

4 pm

5 pm

6 pm

7 pm

8 pm

9 pm

10 pm

11 pm

1200

1300

1400

1500

1600

1700

1800

1900

2000

2100

2200

2300

Examples

2100 becomes

2000 becomes

1730 becomes

2208 becomes

2006 becomes

1350 becomes

To go from 24 hour clock to 12 hour clock just subtract 12 from the hours if it is greater than 12:

9 pm

8 pm

5:30 pm

10:08 pm

8:06 pm

1:50 pm

Created by Mr.Lafferty Maths Dept

slide6

Converting Time

Level D

Let’s make up our own questions !

Key Points

pm times add on 12

12 hour clock

24 hour clock

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Analogue clock

Digital clock

ALWAYS use AM or PM

ALWAYS 4 digits

Hours 1 - 12

NEVER use AM or PM

greater than 12

subtract 12

Hours 0 - 24

Created by Mr.Lafferty Maths Dept

slide7

Time

Level D

Now try Exercise 1

Ch4 (page 45)

www.mathsrevision.com

Created by Mr.Lafferty Maths Dept

starter questions8

Level D

P

Starter Questions

Q

R

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Created by Mr.Lafferty Maths Dept

counting method

Level D

Counting Method

Learning Intention

Success Criteria

  • To explain the counting method to find the difference between two times.
  • 1. Understand the counting method.
  • 2. Find time differences between two times, showing all working.

www.mathsrevision.com

Created by Mr.Lafferty Maths Dept

slide10

Counting Method

Level D

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

Hrs Mins

nearest

hour

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What’s left

20

hours

2

08 40

09 00

11 00

11 10

+

10

20 mins

2 hrs

10 mins

2 30

Created by Mr.Lafferty Maths Dept

slide11

But there are

60 minutes = 1hour

70 mins = 1hr 10mins

Counting Method

Level D

A bus leaves Kirkintilloch Main Street at 14 40 hrs

and arrives in Aberdeen at 18 50 hrs.

How long was the journey.

nearest

hour

What’s left

Hrs Mins

hours

www.mathsrevision.com

20

14 40

15 00

18 00

18 50

3

20 mins

3 hrs

50 mins

+

50

3 70

4hrs 10 mins

Created by Mr.Lafferty Maths Dept

slide12

Using Timetables

*

*

*

Kirkie Bus Station

0825

0925

1025

2025

2125

2225

Bishopbriggs

0837

0937

1037

And

2037

2137

2237

Milton

0843

0943

1043

Every

2043

2143

2243

Springburn

0848

0948

1048

Hour

2048

2148

2248

Port Dundas

0854

0954

1054

Until

2054

2154

2254

George Square

0902

1002

1102

2102

2202

2302

Glasgow Bus Station

0914

1014

1114

2114

2214

2314

How long does the first bus take from Kirkie to Glasgow.

nearest

hour

Hrs Mins

What’s left

hours

35

35

08 25

09 00

09 00

09 14

0

0

35 mins

0 hrs

14 mins

14

+

14

49

slide13

But there are

60 minutes = 1hour

Counting Method

Level D

Let’s make up our own question !

The key steps are left on the slide to help you.

nearest

hour

What’s left

Hrs Mins

hours

www.mathsrevision.com

mins

hrs

mins

+

Created by Mr.Lafferty Maths Dept

slide14

Counting Method

Level D

Now try Exercise 2

Ch4 (page 47)

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Created by Mr.Lafferty Maths Dept

starter questions15

Level D

Starter Questions

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Created by Mr.Lafferty Maths Dept

slide16

Level D

Minutes and Secs

Time

Learning Intention

Success Criteria

  • To explain how round to the nearest second and also add and subtract minutes and seconds.
  • 1. Round to the nearest second.
  • 2. Add and subtract minutes and seconds.

www.mathsrevision.com

Created by Mr.Lafferty Maths Dept

slide17

Time

Level D

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

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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

slide18

Adding & Subtracting Time

Level D

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

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4 30

2 25

+

6 55

Created by Mr.Lafferty Maths Dept

slide19

Adding & Subtracting Time

Level D

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

slide20

Adding & Subtracting Time

Level D

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

slide21

Adding & Subtracting Time

Level D

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

slide22

Time

Level D

Minute & Seconds

Now try Exercise 3

Ch4 (page 49)

www.mathsrevision.com

Created by Mr.Lafferty Maths Dept