This train line has two tracks which cross at different points.
Can you find all the routes that end at Cheston? How many
different journeys could you make if you were going to visit
four stations in this network? How about if there were five
stations? Can you predict the number of journeys for seven A
brief video looking at how you can sometimes use symmetry to
distinguish knots. Can you use this idea to investigate the
differences between the granny knot and the reef knot? Many
natural systems appear to be in equilibrium until suddenly a
critical point is reached, setting up a mudslide or an avalanche
or an earthquake. In this project, students will use a simple. .
. . Basic strategy games are particularly suitable as starting
points for investigations. Players instinctively try to discover
a winning strategy, and usually the best way to do this is to
analyse. . . . This article for students gives some instructions
about how to make some different braids. Problem solving is at
the heart of the NRICH site. A