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- There are 60 seconds in 1 minute.
- There are 60 minutes in 1 hour.
- There are 24 hours in 1 day.
- There are 7 days in 1 week. The number of days in each month varies: there are 31 days in January, March, May, July, August, October, and December; 30 days in April, June, September and November; and 28 days in February—except in leap years, when there are 29 days in February.
- There are therefore 365 days in a year, except in leap years, when there are 366 days.
- Leap years normally occur every 4 years, handily when the year numbers are divisible by 4. So, the next ones will be 2020, 2024, 2028, 2032, and so on—with a few exceptions. For example, 2100 will not be a leap year, but 2104, 2108, 2112 and so on will be leap years.
- There are 10 years in 1 decade and 100 years in 1 century.
Interactive GeoGebra activityWith thanks to Anthony C.M. OR, whose Telling time from clocks worksheet is available here. Material modified and embedded here under the CC-BY-SA 3.0 license.
Part 1 – Telling the time using the 12- or 24-hour clock
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Part 2 – Solving problems involving timetables and time zones
Find out why time travel is not just science fiction, and how we know that time is not absolute – to an extent that makes a material difference to the accuracy of GPS. Teachers: log in to view this content.