60All NRICH live resourceshttp://nrich.maths.org/en 2012 http://nrich.maths.org/public/terms.phpRhombuses from DiagonalsTake a look at the video showing rhombuses and their diagonals...http://nrich.maths.org/10704Sat, 01 Feb 2014 00:00:01 +0000Drawing SquaresTake a look at the video showing squares drawn on dotty grids...http://nrich.maths.org/10700Sat, 01 Feb 2014 00:00:01 +0000Getting Round the CityIn a city with a grid system of roads, how do you get from A to B?http://nrich.maths.org/10796Sat, 01 Feb 2014 00:00:01 +0000Exploring DiagonalsMove the corner of the rectangle. Can you work out what the purple number represents?http://nrich.maths.org/10666Sat, 01 Feb 2014 00:00:01 +0000Advent Calendar 2014 - SecondaryA mathematical challenge for each day during the run-up to Christmas.http://nrich.maths.org/11330Sat, 01 Nov 2014 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 +0000Picture This!http://nrich.maths.org/9683Thu, 01 Nov 2012 00:00:01 +0000Nine EigenExplore how matrices can fix vectors and vector directions.http://nrich.maths.org/6877Tue, 01 Feb 2011 00:00:01 +0000Factorisable QuadraticsThis will encourage you to think about whether all quadratics can be factorised and to develop a better understanding of the effect that changing the coefficients has on the factorised form.http://nrich.maths.org/11265Mon, 01 Sep 2014 00:00:01 +0100Powerful QuadraticsThis comes in two parts, with the first being less fiendish than the second. Itâ€™s great for practising both quadratics and laws of indices, and you can get a lot from making sure that you find all the solutions. For a real challenge (requiring a bit more knowledge), you could consider finding the complex solutions.http://nrich.maths.org/11263Mon, 01 Sep 2014 00:00:01 +0100Giants Posterhttp://nrich.maths.org/11227Mon, 01 Sep 2014 00:00:01 +0100A Big PowerHave you ever tried to work out the largest number that your calculator can cope with? What about your computer? Perhaps you tried using powers to make really large numbers. In this problem you will think about how much you can do to understand such numbers when your calculator is less than helpful!http://nrich.maths.org/11311Wed, 01 Dec 1999 00:00:01 +0000Factorial FragmentsHere you have an expression containing logs and factorials! What can you do with it?http://nrich.maths.org/11310Wed, 01 Dec 1999 00:00:01 +0000Proving the Laws of LogarithmsHere you have an opportunity to explore the proofs of the laws of logarithms.http://nrich.maths.org/11309Wed, 01 Dec 1999 00:00:01 +0000Summing to OneThis problem is a nice introduction that will give you a feeling for how logs work and what that button on your calculator might be doing.http://nrich.maths.org/11308Wed, 01 Dec 1999 00:00:01 +0000