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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

**Teachers**: log in to access the following:

- Slides in PPTX (with click-to-reveal answers)
- Slides in PDF (one slide per page, suitable for importing into IWB software)

- Worksheet G14d Part 1 Telling the time using the 12- or 24-hour clock
- Handout (slides with exercises only; 4 per page for reduced printing)

- Skills drill worksheet 1 – reading analogue clocks (15 questions on one side of A4; answers included)
- Skills drill worksheet 2 – drawing hands on analogue clocks (15 questions on one side of A4; answers included)

**Teachers**: log in to access these.

# Part 2 – Solving problems involving timetables and time zones

**Teachers**: log in to access the following:

- Slides in PPTX (with click-to-reveal answers)
- Slides in PDF (one slide per page, suitable for importing into IWB software)

- Worksheet (with space for student work)
- Handout (slides with exercises only; 4 per page for reduced printing)

- Skills drill worksheet 1 – train timetable activity (15 questions on one side of A4; answers included)
- Skills drill worksheet 2 – problems involving time zones (15 questions on one side of A4; answers included)

**Teachers**: log in to access these.

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.