With only about two minutes to go before the end-of-lesson bell rings the news comes in that there is a bomb in the classroom that needs defusing before the bell goes. The teacher comes up with a suitably large number as the 'danger level' (189 for example) then pupils take it in turns to subtract a fixed number (7 for example) from the danger level. The class shared objective is to reduce the danger level to zero before the bell goes. Great fun!
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