4.4.2
Time
The 12-Hour Clock
The 12-Hour Clock
The minute hand shows the exact minute past the hour.
Sections of a clock
Sections of a clock
- Each number represents a different number of minutes.
- The number of minutes between each number on the clock is 5 minutes.
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Example
Example
- This clock shows the time as 10 past 3. This is because:
- The minute hand has passed two five minute sections since passing o'clock (at 12).
- The last number the hour hand passed was 3.
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Example 2
Example 2
- This clock shows the time as 10 to 8. This is because:
- The minute hand has two more five minute sections until it reaches o'clock (at 12).
- The next number the hour hand passes will be 8.
24-Hour Clock
24-Hour Clock
The 24-hour clock doesn't use am or pm. Instead, it gives the hour of the day starting from 0 at the start of the day and running up to 24 at the end of the day. 12 is at midday.
In the morning (am)
In the morning (am)
- Times before midday are the same in a 24-hour or 12-hour format. The only difference is you don't need the "am" when using the 24-hour clock.
- E.g. 10:40 am is 10:40 in the 24-hour clock.
- E.g. 09:20 am is 09:20 in the 24-hour clock.
Midday
Midday
- Midday is the same in the 24-hour and 12-hour clock with the "pm" removed.
- Midday in the 12-hour clock is 12:00 pm or 12:00 noon.
- Midday in the 24-hour clock is 12:00.
In the afternoon (pm)
In the afternoon (pm)
- 1 o'clock in the afternoon is 1:00 pm in the 12-hour clock.
- 1 o'clock in the afternoon is 13:00 in the 24-hour clock.
- This is because the 24-hour clock carries on counting from 12 noon.
Examples
Examples
- 6 o'clock in the afternoon is 18:00 in the 24-hour clock.
- 4 o'clock in the morning is 04:00 in the 24-hour clock.
- 12 midnight is 00:00 in the 24-hour clock.
- 10 o'clock in the evening is 22:00 in the 24-hour clock.
Uses of the 24-hour clock
Uses of the 24-hour clock
- The 24-hour clock is often used on timetables.
- E.g. bus, train and plane timetables
- You'll also normally see the time on your phone in a 24-hour clock.
Reading Timetables
Reading Timetables
You can use timetables to work out differences in time and when certain events will start. You need to be familiar with the 24-hour and 12-hour clock for this topic
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Timetables
Timetables
- Train/bus timetables have locations in the first column.
- Each column after that shows the running of a single train/bus.
- The time shown shows the time that train/bus leaves from each location.
- The first location is displayed at the top of the table and the last location is at the bottom.
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Example
Example
- The first train left Derby ar 11:25, got to Sheffield at 12:06, Wakefield Westgate at 12:36, Leeds at 12:54, York at 13:31 and Darlington at 14:02.
- The second train left Derby ar 11:55, got to Sheffield at 12:56, Wakefield Westgate at 13:06, Leeds at 13:24, etc.
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Example 2
Example 2
- The dashes (−) mean that the train did not stop at that location.
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Calculations
Calculations
- You can use the timetable to work out the journey times between different locations.
- E.g. the journey time from Wakefield Westgate to Leeds is the difference between 12:36 and 12:54. The difference in this example is 18 minutes.
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Example
Example
- The journey time from Sheffield to Leeds when the train makes a stop at Wakefield Westgate is the difference between 12:06 and 12:54. The difference in this example is 48 minutes.
- The journey time from Sheffield to Leeds when the train doesn't a stop at Wakefield Westgate is the difference between 13:06 and 13:49. The difference in this example is 43 minutes.
1Numbers
1.1Integers
1.3Decimals
1.4Powers & Roots
1.5Set Language & Notation
1.6Percentages
1.7Ratio & Proportion
2Equations, Formulae & Identities
2.1Algebraic Manipulation
2.2Expressions & Formulae
2.3Linear Equations
2.4Quadratic Equations
2.5Proportion
3Sequences, Functions & Graphs
3.1Sequences
3.3Graphs
3.4Common Graphs
4Geometry
4.1Angles, Lines & Triangles
4.2Polygons
4.5Circle Properties
4.6Trigonometry & Pythagoras’ theorem
4.7Mensuration of 2D Shapes
4.83D Shapes & Volume
5Vectors & Transformation Geometry
6Statistics & Probability
6.1Statistical Measures
6.2Graphical Representation of Data
Jump to other topics
1Numbers
1.1Integers
1.3Decimals
1.4Powers & Roots
1.5Set Language & Notation
1.6Percentages
1.7Ratio & Proportion
2Equations, Formulae & Identities
2.1Algebraic Manipulation
2.2Expressions & Formulae
2.3Linear Equations
2.4Quadratic Equations
2.5Proportion
3Sequences, Functions & Graphs
3.1Sequences
3.3Graphs
3.4Common Graphs
4Geometry
4.1Angles, Lines & Triangles
4.2Polygons
4.5Circle Properties
4.6Trigonometry & Pythagoras’ theorem
4.7Mensuration of 2D Shapes
4.83D Shapes & Volume
5Vectors & Transformation Geometry
6Statistics & Probability
6.1Statistical Measures
6.2Graphical Representation of Data
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