### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Revise 24-hour clock times. Revise counting up on a time number line to calculate time intervals in the context of school lessons, e.g. from 10:45 to 11:35, 13:30 to 14:45, 11:50 to 12:35.**Group Activities**

-- Calculate time intervals on the class timetable.

-- Calculate time intervals on the class timetable, then compare with lesson durations in a younger class.

**Day 2 Teaching**

Ask questions requiring simple interpretation of the Hogwarts Train Timetable, e.g. What time does the 08:45 reach Ottery St Catchpole? Convert 24-hour to 12-hour times and vice versa. Then ask questions requiring calculation of time intervals, e.g. How long does the 08:45 from Diagon Alley take to reach Ottery St Catchpole? Which is the fastest train between Kings Cross and Hogwarts?**Group Activities**

-- Investigate journey times by interpreting a train timetable.

**Day 3 Teaching**

Use and interpret the timetable for the North Yorkshire Steam Railway. Practise writing 24-hour times as 12-hour times. Calculate time intervals and solve reasoning problems.**Group Activities**

-- Plan itineraries using a real railway timetable.

**Day 4 Teaching**

Give fictitious train delay announcements, e.g. The 14:48 to Birmingham New Street is running approximately 37 minutes late as a result of sheep on the line near Worcester. Model counting up on a number line to find the new departure time. Repeat.**Group Activities**

-- Use counting on on a number line as a strategy for adding a time duration to a start time.