60Lower Secondary big button pagehttp://nrich.maths.org/secondary-loweren 2012 http://nrich.maths.org/public/terms.phpExploring Our Number Systemhttp://nrich.maths.org/12494Wed, 01 Dec 1999 00:00:01 +0000Wild Maths - share what you have tried and discoveredHere's how you can send your solutions to these Wild Maths problems. You may be featured in our Showcase!http://nrich.maths.org/12320Wed, 01 Dec 1999 00:00:01 +0000Introductory VideoAn introductory video to the Probability and Evidence collectionhttp://nrich.maths.org/12241Wed, 01 Dec 1999 00:00:01 +0000Matching CriminalsDNA profiling is an invaluable tool for the police. However, when it comes to probability, things aren't always as straightforward as they seem.http://nrich.maths.org/12215Wed, 01 Dec 1999 00:00:01 +0000The ELISA TestIn 1% of cases, an HIV test gives a positive result for someone who is HIV negative. How likely is it that someone who tests positive has HIV?http://nrich.maths.org/12178Wed, 01 Dec 1999 00:00:01 +0000Do Rare Events Happen?I'd be very surprised if I had three children all with the same birthday, but I read in the paper that it happened to one family...http://nrich.maths.org/12177Wed, 01 Dec 1999 00:00:01 +0000Trusting the TabloidsCan you match the cards and figure out whether the tabloid headlines can be trusted?http://nrich.maths.org/12172Wed, 01 Dec 1999 00:00:01 +0000Spots and Measles99% of people who have measles have spots. Ben has spots. Do you think he has measles?http://nrich.maths.org/12171Wed, 01 Dec 1999 00:00:01 +0000Risk and CrimeAre you at risk of being a victim of crime? How does your perception of that risk compare with the facts and figures?http://nrich.maths.org/12167Wed, 01 Dec 1999 00:00:01 +0000Statins and Risk"Statins cut the risks of heart attacks and strokes by 40%"<br />
Should the Professor take statins? Can you help him decide?http://nrich.maths.org/12165Wed, 01 Dec 1999 00:00:01 +0000Journey to SchoolHow risky is your journey to school?http://nrich.maths.org/12164Wed, 01 Dec 1999 00:00:01 +0000How Risky is a Bacon Sandwich?Newspapers said that eating a bacon sandwich every day raises the risk of bowel cancer by 20%. Should you be concerned?http://nrich.maths.org/12163Wed, 01 Dec 1999 00:00:01 +0000MaxagonWhat's the greatest number of sides a polygon on a dotty grid could have?http://nrich.maths.org/11236Wed, 01 Jul 2015 00:00:01 +0100Completing QuadrilateralsWe started drawing some quadrilaterals - can you complete them?http://nrich.maths.org/11234Wed, 01 Apr 2015 00:00:01 +0100Puzzling Place ValueCan you explain what is going on in these puzzling number tricks?http://nrich.maths.org/11215Wed, 01 Apr 2015 00:00:01 +0100Regular Hexagon LoopsMake some loops out of regular hexagons. What rules can you discover?http://nrich.maths.org/11206Wed, 01 Jul 2015 00:00:01 +0100Guess my QuadHow many questions do you need to identify my quadrilateral?http://nrich.maths.org/11202Wed, 01 Jul 2015 00:00:01 +0100ReversalsWhere should you start, if you want to finish back where you started?http://nrich.maths.org/11118Mon, 01 Sep 2014 00:00:01 +0100Making a DifferenceHow many different differences can you make?http://nrich.maths.org/11012Wed, 01 Apr 2015 00:00:01 +0100Beach HutsCan you figure out how sequences of beach huts are generated?http://nrich.maths.org/11008Mon, 01 Sep 2014 00:00:01 +0100