You are watching: How many minutes is 12 hours

### What are the 12-hour and 24-hour clock?

There are two ways of telling the time:

The **12-hour clock** runs from 1am to 12 noon and then from 1pm to 12 midnight.

The **24-hour clock** uses the numbers 00:00 to 23:59 (midnight is 00:00).

12-hour clock | 24-hour clock |

1am | 01.00 |

2am | 02.00 |

3am | 03.00 |

4am | 04.00 |

5am | 05.00 |

6am | 06.00 |

7am | 07.00 |

8am | 08.00 |

9am | 09.00 |

10am | 10.00 |

11am | 11.00 |

12 noon | 12.00 |

1pm | 13.00 |

2pm | 14.00 |

3pm | 15.00 |

4pm | 16.00 |

5pm | 17.00 |

6pm | 18.00 |

7pm | 19.00 |

8pm | 20.00 |

9pm | 21.00 |

10pm | 22.00 |

11pm | 23.00 |

12 midnight | 24.00 |

Children in **Year 1** learn to tell the time on a **12-hour analogue clock** which looks like this:

**At this point, they learn to tell the time to the hour and half hour.**

In **Year 2** they learn that there are **24 hours in a day, ****60 minutes in an hour, and 30 minutes in half an hour**. They move onto **reading the time to the quarter hour and then the nearest five minutes**. They also start to learn about **time intervals** (working out the length of time between two times).

In **Year 3**, children learn that there are 60 seconds in a minute. They continue to tell the time with increasing speed and accuracy. Here is an example of a time interval word problem involving the 12-hour clock that they might come across:

*I put some lamb in the oven at 10.30 in the morning. I take it out at 11.20 the same morning. How long has it been in the oven?*

In **Year 4**, children need to convert between units of time (hour and minutes). They need to read, write and convert time between analogue and digital 12-hour and 24-hour clocks.

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In **Years 5 and 6**, children are asked to solve problems involving converting between units of time. A Year 5 or 6 child might come across a problem like the following, that requires them to work out a time interval using their knowledge of both the 12-hour and 24-hour clock:

*I get the 13:46 train to Manchester, which takes exactly three hours and five minutes. How many minutes before 5pm do I arrive in Manchester?*

If a child were struggling with this, they might be encouraged to draw a number line in order to count forward the 3 hours and 5 minutes:

They could then convert the 24-hour clock time to 12-hour time, which would be 4:51pm. They should then be able to work out that they would arrive in Manchester 9 minutes before 5pm.