Units of time

Seconds, minutes, hours, days, weeks and years, and month lengths.

The 12-hour and 24-hour clock

Writing the same time in both notations, and where midnight causes trouble.

Finding a duration between two times

Working out the time between two clock times by bridging to the next whole hour.

Reading timetables

Journey and waiting times from a timetable, and choosing a service.

Decimal hours

Converting between hours and minutes and decimal hours for rate work.