As an additional function the outer red wheel can be freely spun by pulling quickly and releasing and this will spin the hands of the clock to a random time. This function will be easier on an interactive whiteboard than with using a mouse.
EDIT: I have now added a clock for when you want to introduce roman numeral clocks. This one references the clock that often has the name of its bell extended to it, Big Ben. There is still a rotating bevel on this on and it works like the simple clock. The bevel is invisible unless you start to drag it.
The image of the clock tower is courtesy of DAVID ILIFF and is used under a Wikipedia Commons license.
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For standard IWB clock go to interactive whiteboard clock.
A version of this clock, with extra features, forms part of the Numeracy Basics app for iPad. More details here.
For roman numerals “Big Ben” clock go to interactive whiteboard clock.