How do I teach 24-hour time?

The 24-hour clock is more often shown on digital clocks and is written in a 4-digit form, with the first two digits representing the hour and the last two representing the minutes. There is no need for a.m. or p.m. as each time represents each hour in a 24-hour day.

How do you explain 12 and 24-hour 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). 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.

What is a 24-hour clock called?

The 24 hour clock has also been called railway time (in Europe), continental time (in England), and military or (a long time ago) railroad time (in the US). By the way, it’s only in the US (where 5% of the world’s population live) that the 24 hour time system is called military time.

What is a 24-hour clock used for?

The 24-hour clock is commonly used there only in some specialist areas (military, aviation, navigation, tourism, meteorology, astronomy, computing, logistics, emergency services, hospitals), where the ambiguities of the 12-hour notation are deemed too inconvenient, cumbersome, or dangerous.

How do you tell 24-hour clock?

How do we tell the time using the 24-hour clock? If we’re using a 12-hour clock, we tell the time from 1am to 12 noon and 1pm until 12 midnight. If we’re using the 24-hour clock (sometimes known as a ‘military time clock’ in the USA), the time starts at 00.01 and finishes at 23:59. Midnight is written as 00:00.

Why 24-hour clock is used?

Our 24-hour day comes from the ancient Egyptians who divided day-time into 10 hours they measured with devices such as shadow clocks, and added a twilight hour at the beginning and another one at the end of the day-time, says Lomb. “Night-time was divided in 12 hours, based on the observations of stars.

Why do we use the 24-hour clock?

Originally Answered: What is the purpose of 24 hour clock? The purpose of a 24hr clock is to tell the time. It’s used widely in Europe, and also by the military worldwide. The reason it is favoured over a 12hr clock is that it unambiguously labels the hours.

Who uses the 24-hour clock?

Almost all countries use 24-hour clock. It’s particularly North America, UK, Egypt, India, the Philippines, Colombia, Saudi Arabia, and Australia where the 12-hour clock is the predominant form of stating the time.

How do you write 24-hour clock in words?

24-hour clock In general, to write time in the 24-hour system, omit the colon between hours and minutes, and follow the numerals for time with the word “hours.” The invasion began at 0823 hours . Read aloud as “oh-eight-twenty-three hours” or “zero-eight-twenty-three” (military).

What is the importance of 24-hour clock?

What is a 24-hour clock?

How do you convert 12 Hour clocks to 24 hour clocks?

Get down to business with time conversion, using these 12-hour clocks to 24-hour clocks worksheets! 12 a.m. is 00.00 hours. From 12 midnight to 12.59 a.m., subtract 12 hours. From 1 a.m. to 12.59 p.m., there’s no change.

How can I use clock worksheets in the classroom?

Use these printable clock worksheets with your maths class to teach them how to convert time from a 12-hour digital clock to a 24-hour clock, and vice versa. This useful life skill will give them a better grasp of telling the time, and teach them how to add and subtract to convert units of time.

How do you write time in 24-hour clock notation?

First up are a set of a.m/p.m. times to be written in 24-hour clock notation. Then, there are a bunch of 24-hour times to be converted into a.m./p.m. Pull out all the stops for a perfect time conversion experience in these grade 4 and grade 5 worksheets! Read each clock and write the time first in the 12-hour format and then in the 24-hour format.