60All NRICH live resourceshttp://nrich.maths.org/en 2012 http://nrich.maths.org/public/terms.phpFit for PhotocopyingExplore the relationships between different paper sizes.http://nrich.maths.org/7385Tue, 01 Feb 2011 00:00:01 +0000Strolling AlongWhat happens when we multiply a complex number by a real or an imaginary number?http://nrich.maths.org/13131Wed, 01 Dec 1999 00:00:01 +0000Opening the DoorWhat happens when we add together two complex numbers?http://nrich.maths.org/13129Wed, 01 Dec 1999 00:00:01 +0000Picture This!http://nrich.maths.org/9683Thu, 01 Nov 2012 00:00:01 +0000The Root of the ProblemFind the sum of this series of surds.http://nrich.maths.org/901Tue, 01 Feb 2011 00:00:01 +0000Advanced Mathematics on Dotty GridsA dotty grid is a very simple mathematical structure that offers potential for very deep thought...http://nrich.maths.org/10813Sat, 01 Mar 2014 00:00:01 +0000Mixed BagA collection of intriguing questions involving logarithms.http://nrich.maths.org/12382Wed, 01 Dec 1999 00:00:01 +0000Two-way CalculusCan you find functions with the desired properties to fill in the table? <a href="https://undergroundmathematics.org/calculus-meets-functions/two-way-calculus"></a>http://nrich.maths.org/12379Wed, 01 Dec 1999 00:00:01 +0000Trig TablesCan you fill in all the missing values and trig functions to make the tables complete? <a href="https://undergroundmathematics.org/trigonometry-triangles-to-functions/trig-tables"></a>http://nrich.maths.org/12381Wed, 01 Dec 1999 00:00:01 +0000ComposeCan you compose four functions to create the set of functions given? <a href="https://undergroundmathematics.org/combining-functions/compose"></a>http://nrich.maths.org/12380Wed, 01 Dec 1999 00:00:01 +0000Inspecting IdentitiesUsing trig identities to help sketch graphs of functionshttp://nrich.maths.org/12146Thu, 01 Jan 2015 00:00:01 +0000Nine EigenExplore how matrices can fix vectors and vector directions.http://nrich.maths.org/6877Tue, 01 Feb 2011 00:00:01 +0000Irrational ArithmagonsCan you work out the irrational numbers that belong in the circles to make the multiplication arithmagon correct?http://nrich.maths.org/7448Tue, 01 Feb 2011 00:00:01 +0000Giants Posterhttp://nrich.maths.org/11227Mon, 01 Sep 2014 00:00:01 +0100Name That GraphHow can you work out the equation of a parabola just by looking at key features of its graph?http://nrich.maths.org/11922Wed, 01 Dec 1999 00:00:01 +0000