Units of time and the calendar

Find the time a given number of hours and minutes before another; working out the length of time between two events (minutes, hours, days, weeks); Find the total time of a number of times (given in hours and minutes); Convert a 'decimal' time period into hours, minutes and seconds (and vice versa)

2 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.