60http://nrich.maths.org/en 2012 http://nrich.maths.org/public/terms.phpA task which depends on members of the group noticing the needs of others and responding.http://nrich.maths.org/6938Tue, 01 Feb 2011 00:00:01 +0000This task develops spatial reasoning skills. By framing and asking questions a member of the team has to find out what mathematical object they have chosen.http://nrich.maths.org/6986Tue, 01 Feb 2011 00:00:01 +0000Different combinations of the weights available allow you to make different totals. Which totals can you make?http://nrich.maths.org/5958Tue, 01 Feb 2011 00:00:01 +0000Imagine a very strange bank account where you are only allowed to do two things...http://nrich.maths.org/9923Mon, 01 Apr 2013 00:00:01 +0100Investigate different ways of making £5 at Charlie's bank.http://nrich.maths.org/9943Wed, 01 Dec 1999 00:00:01 +0000Use the animation to help you work out how many lines are needed to draw mystic roses of different sizes.http://nrich.maths.org/6703Tue, 01 Feb 2011 00:00:01 +0000Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?http://nrich.maths.org/8078Fri, 01 Jun 2012 00:00:01 +0100Can you find out what is special about the dimensions of rectangles you can make with squares, sticks and units?http://nrich.maths.org/7490Tue, 01 May 2012 00:00:01 +0100In this problem, we define complex numbers and invite you to explore what happens when you add and multiply them.http://nrich.maths.org/9858Fri, 01 Feb 2013 00:00:01 +0000Complex numbers can be represented graphically using an Argand diagram. This problem explains more...http://nrich.maths.org/9859Fri, 01 Feb 2013 00:00:01 +0000http://nrich.maths.org/9683Thu, 01 Nov 2012 00:00:01 +0000On October 14th 2012, Felix Baumgartner made a world record breaking parachute jump. Can you figure out the numbers behind his jump?http://nrich.maths.org/9556Mon, 01 Oct 2012 00:00:01 +0100What happens when we square complex numbers? Can the square of a complex number be real?http://nrich.maths.org/8109Fri, 01 Mar 2013 00:00:01 +0000How can you quickly sort a suit of cards in order from Ace to King?http://nrich.maths.org/8192Mon, 01 Oct 2012 00:00:01 +0100Can you make matrices which will fix one lucky vector and crush another to zero?http://nrich.maths.org/6575Tue, 01 Feb 2011 00:00:01 +0000