The first bell rings every 6 minutes,
The second bell rings every 7 minutes,
The third bell rings every hour.
If all the bells ring together at noon, at what time will they next all ring together?
Here is a simulation of the ringing bells using seconds rather than minutes.
You can find many more ChristMaths activities at:
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Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a related fun student activity.
Here is the URL which will take them to a more traditional exercise on finding the lowest common multiple and highest common factor.