Teaching Presentation: Calculate time intervals; 24 hour clock (Year 4 Measures and Data)

This presentation provides three days of teaching that cover the objective:

• Tell time and calculate time intervals; 24 hour clock

It includes starter activities, whole class teaching, group activities, practice sheets and mastery questions. It can be used on a variety of interactive whiteboards.

Day 1 Teaching
Use ITP Tell the time and show several times. Match digital to analogue times and ensure children understand ‘to’ as well as ‘past’ the hour times. Introduce 24-hour clock, explaining that for pm times we add 12 hours.

Day 2 Teaching
Ask why we use a 24-hour clock. Say it helps to differentiate between am and pm times. Explain that we don’t say 13 o’clock but 13 hundred hours and 16:45 as sixteen forty-five. Practise saying different 24-hour times by writing them on the board and asking children to read them out. Write 24-hour times in a 2 × 3 grid and ask children to convert them to 12-hour am/pm times in their own grids.

Day 3 Teaching
Show a 24-hour train timetable (see resources). Ask how we know if the times are am/pm? Why do train timetables use 24-hour time? Establish that it helps travellers make sure they turn up at the right time of day! Use a train timetable to calculate intervals.

This teaching is part of Hamilton’s Year 4 Measures and Data block. Each Hamilton maths block contains a complete set of planning and resources to teach a term’s worth of objectives for one of the National Curriculum for England’s maths areas.