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Thu, 2 Feb 2006 09:05:43 +0000

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 ```Dear all, The February edition of the NRICH website is now live at www.nrich.maths.org. This month's site is bursting with a variety of rich and challenging problems all based on the mathematical theme of Ratio and Proportion. Story books have been the inspiration for two of our problems, one of which your pupils are likely to be familiar with - Goldilocks and the Three Bears. Try Once Upon a Time () where all the Bears' possessions are in the same proportions as their heights. Just how deep is Baby Bear's bowl? How strong do your class like their fruit drink? Can they work out whose blackcurrant squash has the most blackcurrant flavour in Blackcurrantiest ()? Food and drink seem to crop up quite a few times this month - perhaps Nutty Mixture () or Cereal Mix () will tickle your students' taste buds? Somewhat in contrast to food, three problems this month have paint in common. Mixing More Paints () follows on from Mixing Paints () which asks pupils to produce pink paint containing red and white in certain ratios. If they are keen on decorating, they might like to try Tin Tight () - this time they need to investigate the most efficient dimensions for a tin of paint. Or, for something completely different, can your students explore the angle that a billiard ball must be struck at for it to return to its starting position in Orbiting Billiard Balls ()? At the highest level, the problems all focus on fractals. Your class can find out more about the Sierpinski triangle, which is the limit of a series of triangular shapes, in the Sierpinski Triangle problem (). It invites them to work towards finding the total area of the triangles which have been removed. There are several extras on the site this month, Ratio Pairs 2 () and Ratio Pairs 3 (), where you must match cards representing equivalent ratios, and a different slant on Su Doku, Intersection Su Doku (). Are your students up for the challenge? Please don't forget to persuade pupils to keep their solutions coming in. They might see their names on the site next month! With best wishes from The NRICH Team. Liz Pumfrey NRICH Primary Teacher Research Associate University of Cambridge Centre for Mathematical Sciences Wilberforce Road Cambridge CB3 0WA 01223 764246 www.nrich.maths.org _______________________________________________ To post to the list send an email to [log in to unmask] To unsubscribe send an email to [log in to unmask] with the message body UNSUBSCRIBE NRICH-SUPPORT or unsubscribe via the web at http://www.jiscmail.ac.uk/cgi-bin/wa.exe?REPORT&Z=3```