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NRICH-TALK  March 2007

NRICH-TALK March 2007

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Subject:

NRICH March Newsletter

From:

Liz Pumfrey <[log in to unmask]>

Reply-To:

Liz Pumfrey <[log in to unmask]>

Date:

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 
<http://nrich.maths.org/public/viewer.php?obj_id=5572&part=index> and 
one on the multiplication square 
<http://nrich.maths.org/public/viewer.php?obj_id=5573&part=index> . 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 
<http://nrich.maths.org/public/viewer.php?obj_id=5546&part=index> 
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 
<http://nrich.maths.org/public/viewer.php?obj_id=5469&part=index> 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 
<http://nrich.maths.org/public/viewer.php?obj_id=5462&part=index> . 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 
<http://nrich.maths.org/public/viewer.php?obj_id=5594&part=index> gives 
arrow arithmetic a bit of a twist and Twizzle Wind Up 
<http://nrich.maths.org/public/viewer.php?obj_id=5597&part=index> 
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 
<http://nrich.maths.org/public/viewer.php?obj_id=5600&part=index> ?

The Stage 5 problems this month all ask you to prove results. Elevens 
<http://nrich.maths.org/public/viewer.php?obj_id=5510&part=index> and 
Tens <http://nrich.maths.org/public/viewer.php?obj_id=5562&part=index> 
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

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