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 such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments:
However it would be better to assign one of the student interactive activities below.
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.