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## NRICH-TALK@JISCMAIL.AC.UK

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Mon, 5 Mar 2007 09:33:31 +0000

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 ```Dear all, The March edition of the NRICH website is now live at http://nrich.maths.org where our mathematical theme this month is Number. We have two interactive jigsaws for you to complete at primary level, one based on the 100 square and one on the multiplication square . If you would prefer to try the jigsaws away from the computer, you could always print off the pieces which are also provided for you. For a more open-ended challenge, try the Street Sequences investigation which asks you to look at different ways of adding house numbers. What do you notice about the totals you get? Can you explain why? Route to Infinity will certainly draw you in and make you determined to reach a solution! Test your understanding by looking away from the screen and giving the first few coordinates of the route drawn. Through how many points does the route pass before it reaches the point (9, 4)? If you want to impress your friends with your mathematical know-how, try the Cunning Card Trick . The real challenge here is explaining why it works! You might remember that last month, the Stage 4 problems were about finding a way to do arithmetic using geometry, where numbers are represented by a double arrow. This month Twizzle Arithmetic gives arrow arithmetic a bit of a twist and Twizzle Wind Up continues the ideas. For the finale, can you make the twizzle twist on its spot and so work out the hidden link in Twizzle Twists ? The Stage 5 problems this month all ask you to prove results. Elevens and Tens each focus on multiples, and you are encouraged to spot patterns, make conjectures and then to prove these conjectures. As well as thinking about key methods of proof, you'll be doing lots of algebraic manipulation as you work on these problems. We look forward to receiving your solutions. Best wishes from The NRICH Team. -- Liz Pumfrey NRICH Primary Coordinator 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-TALK or unsubscribe via the web at http://www.jiscmail.ac.uk/cgi-bin/wa.exe?REPORT&Z=3```