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Dear all, A belated message to let you know that the April edition of NRICH is now online at http://nrich.maths.org. As you might remember, in April, August and December the site contains two extra open-ended, investigative challenges and this month these are Investigating Pascal's Triangle <http://nrich.maths.org/public/viewer.php?obj_id=5593&part=index> and Like a Circle in a Spiral <http://nrich.maths.org/public/viewer.php?obj_id=5603&part=index> . To find them follow the links or select "This month" in the left-hand menu. We hope these challenges will intrigue and inspire you, as well as encourage you to talk to others about what you're doing. We also have an extra article for you: Paper Folding - Models of the Platonic Solids <http://nrich.maths.org/public/viewer.php?obj_id=5480&part=index> which describes how to build models of the Platonic solids simply using sheets of paper. Have a go - you'll amaze your friends with the results! As in previous months, we have a new Sudoku to tantalise you: Ratio Sudoku 3 <http://nrich.maths.org/public/viewer.php?obj_id=5604&part=index> . This time, the puzzle can be solved with the help of small clue numbers which are ratios or fractions of two digits in the two squares that are horizontally or vertically or diagonally adjacent to each other. As usual, solutions to the current problems will appear at the beginning of May. Back in January, we wrote to invite you to complete a questionnaire developed by Libby Jared as part of her current educational research. There has been a pleasing number of responses so far and Libby is very grateful to everyone who has given her information. Nevertheless, even now more replies will be received with the same amount of gratitude. She would like to make one last request for final contributions as you return to school following the Easter Break. If there is anybody remaining who would be able to complete the questionnaire before the end of April then that would be great! It will disappear off the site at the end of this month. Follow this link: http://freeonlinesurveys.com/rendersurvey.asp?sid=fcexf2js7z2gnfp248623 or click on the "Questionnaire" menu item on NRICH: http://nrich.maths.org/public/viewer.php?obj_id=5583 With 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