60Upper Secondary Big Buttonhttp://nrich.maths.org/secondary-upperen 2012 http://nrich.maths.org/public/terms.phpTo Log or Not to Log?Which of these logarithmic challenges can you solve?http://nrich.maths.org/12255Wed, 01 Dec 1999 00:00:01 +0000Log LatticeCan you figure out how each log fits into the lattice?http://nrich.maths.org/12254Wed, 01 Dec 1999 00:00:01 +0000How Fast Does it Grow?Exponential functions grow pretty quickly...http://nrich.maths.org/12253Wed, 01 Dec 1999 00:00:01 +0000Reach for the StarsSome graphs grow so quickly you can reach dizzy heights...http://nrich.maths.org/12252Wed, 01 Dec 1999 00:00:01 +0000$t$ for tanCan you find a geometric proof for some $\tan\theta$ trig identities?http://nrich.maths.org/12148Thu, 01 Jan 2015 00:00:01 +0000Proving Half-angle FormulaeCan you find a geometric proof of these half-angle trig identities?http://nrich.maths.org/12147Thu, 01 Jan 2015 00:00:01 +0000Inspecting IdentitiesUsing trig identities to help sketch graphs of functionshttp://nrich.maths.org/12146Thu, 01 Jan 2015 00:00:01 +0000Trig CountdownA game for one or more players in which you make a target value by building a trig expressionhttp://nrich.maths.org/12145Thu, 01 Jan 2015 00:00:01 +0000Paired ParabolasSome parabolas are related to others. How are their equations and graphs connected?http://nrich.maths.org/11924Wed, 01 Dec 1999 00:00:01 +0000Which Fraction Is Bigger?Given two algebraic fractions, how can you decide when each is bigger?http://nrich.maths.org/11923Wed, 01 Dec 1999 00:00:01 +0000Name 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 +0000BetweenIf you know some points on a line, can you work out other points in between?http://nrich.maths.org/11921Wed, 01 Dec 1999 00:00:01 +0000Can You Traverse It?How can you decide if a graph is traversable?http://nrich.maths.org/11826Wed, 01 Dec 1999 00:00:01 +0000Connecting the UtilitiesCan you find a way to connect each house to the utilities without any pipes crossing?http://nrich.maths.org/11825Wed, 01 Dec 1999 00:00:01 +0000Who's Who?Can you solve the clues to find out who's who on the friendship graph?http://nrich.maths.org/11821Wed, 01 Dec 1999 00:00:01 +0000Designing a PolynomialCan you find a polynomial function whose first derivative is equal to the function?http://nrich.maths.org/11740Mon, 01 Jun 2015 00:00:01 +0100Curvy CubicsUse some calculus clues to pin down an equation of a cubic graph.http://nrich.maths.org/11739Mon, 01 Jun 2015 00:00:01 +0100Integral ChasingCan you find the missing constants from these not-quite-so-obvious definite integrals?http://nrich.maths.org/11738Mon, 01 Jun 2015 00:00:01 +0100Can You Find... Cubic CurvesCan you find equations for cubic curves that have specific features?http://nrich.maths.org/11737Mon, 01 Jun 2015 00:00:01 +0100Can You Find... Trigonometric Edition Part 2Can you find trig graphs to satisfy a variety of conditions?http://nrich.maths.org/11647Mon, 01 Jun 2015 00:00:01 +0100Which Parabola?Can you work out the equations of all these mixed up parabolas?http://nrich.maths.org/11646Mon, 01 Jun 2015 00:00:01 +0100Slippery SlopesWhen you transform a function, what can you work out about the gradient?http://nrich.maths.org/11645Mon, 01 Jun 2015 00:00:01 +0100Name That Graph AgainIf you know some information about a parabola, can you work out its equation?http://nrich.maths.org/11644Mon, 01 Jun 2015 00:00:01 +0100Truth Tables and Electronic CircuitsInvestigate circuits and record your findings in this simple introduction to truth tables and logic.http://nrich.maths.org/6025Tue, 01 Feb 2011 00:00:01 +0000Circuit MakerInvestigate how logic gates work in circuits.http://nrich.maths.org/5974Tue, 01 Feb 2011 00:00:01 +0000Simple Counting MachineCan you set the logic gates so that the number of bulbs which are on is the same as the number of switches which are on?http://nrich.maths.org/5973Tue, 01 Feb 2011 00:00:01 +0000Adding MachineCan you set the logic gates so that this machine can decide how many bulbs have been switched on?http://nrich.maths.org/5931Tue, 01 Feb 2011 00:00:01 +0000Euler's FormulaSome simple ideas about graph theory with a discussion of a proof
of Euler's formula relating the numbers of vertces, edges and faces
of a graph.http://nrich.maths.org/4719Tue, 01 Feb 2011 00:00:01 +0000