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Key facts

• 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 activity

In this activity, you can either manually set a time or generate a random time. You can use the ▲ and ▼ arrows show or hide each of the analogue clock face, the time in words, and the digital clock.

Part 1 – Telling the time using the 12- or 24-hour clock

Part 2 – Solving problems involving timetables and time zones