Mathematics
Intermediate
50 mins
Teacher/Student led
+80 XP
What you need:
IWB/Projector/Large Screen

Elapsed Time and Simple Timetables

Learn to find how long a journey takes by counting on from the start time to the finish time, using a real Irish Rail timetable. You'll discover why hopping to the next o'clock first makes the counting easier.

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    1 - Getting Started ~4 mins

    Illustration for Getting StartedA bus from Gaillimh to Salthill leaves at 9:10 and arrives at 9:45. How long did that journey take?

    Have a think: what would you count first to work it out?

    2 - Watch and Notice ~9 mins

    Here is a real Irish Rail timetable, Cork to Dublin. Each column is one train; each row is a stop. The 07:00 train from Cork (Kent) reaches Dublin Heuston at 09:35.

    Watch how we work out a journey time by counting on. First we hop from the start time up to the next whole hour. Then we count the whole hours. Last we count the final few minutes. We'll do this for three journeys, so notice which ones cross an o'clock along the way.

    3 - Try It Together ~9 mins

    The train timetable is back on the board. Your teacher will name a station to leave from and a station to arrive at. Count on from the first time to the second — up to the next full hour, then the rest of the way — and say how long the journey takes. A pupil then taps the two cells so we can all check.

    How long is that journey?

    4 - Write the Journey Length in Your Copy ~3 mins

    COPYBOOK MOMENT

    In your maths copy, use the printed timetable to write the journey length for these three services on the 07:00 train. Show your count-on jumps for each one, like this:

    • Cork → Portlaoise (07:0008:50): 07:0008:00 is 60 min, then 08:0008:50 is 50 min, total 1 h 50 min

    Now write the two jumps and the total for each of these:

    • Mallow → Thurles (07:2008:15)
    • Limerick Junction → Heuston (07:5509:35)
    • Cork → Mallow (07:0007:20)

    5 - Class Challenge ~8 mins

    Each challenge names a service and two stations. Find both times on the timetable, count on from the first to the second, and tap the depart cell then the arrive cell. The hops get longer as you go, and the last ones cross an o'clock.

    Find the journey time

    Pupil practice
    Module 6 · Time and Money Measures
    Lesson 69 · Elapsed Time and Simple Timetables
    Download Activity Book page (PDF)
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