60Upper Primary Pupil big button pagehttp://nrich.maths.org/primary-upperen 2012 http://nrich.maths.org/public/terms.phpReasoningIn our view, you can't do maths without reasoning! But what is mathematical reasoning and when do we need it? Have a go at these activities which give you chances to reason in different ways and for different purposes.http://nrich.maths.org/11025Tue, 01 Jul 2014 00:00:01 +0100Approaching Midnight Jump Straight InIf you'd like to explore the game freely, without any nudges from us, choose this version.http://nrich.maths.org/10781Sat, 01 Feb 2014 00:00:01 +0000Approaching Midnight Taking it FurtherHere we offer some suggestions about how you could take the Approaching Midnight game further.http://nrich.maths.org/10780Sat, 01 Feb 2014 00:00:01 +0000Approaching Midnight the UltimateWant a serious challenge? Have a look at these ideas for changing the Approaching Midnight game.http://nrich.maths.org/10746Sat, 01 Feb 2014 00:00:01 +0000Approaching Midnight What Next?Want some suggestions about where to go next with the game?http://nrich.maths.org/10743Sat, 01 Feb 2014 00:00:01 +0000Approaching Midnight Get StartedLike a bit of help getting into the game? Then have a look at this.http://nrich.maths.org/10725Sat, 01 Feb 2014 00:00:01 +0000That Number Square!Exploring the structure of a number square: how quickly can you put the number tiles in the right place on the grid?http://nrich.maths.org/8169Tue, 01 May 2012 00:00:01 +0100Ip Dip"Ip dip sky blue! Who's 'it'? It's you!" Where would you position yourself so that you are 'it' if there are two players? Three players ...?http://nrich.maths.org/7185Tue, 01 Feb 2011 00:00:01 +0000Strike it OutUse your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.http://nrich.maths.org/6589Tue, 01 Feb 2011 00:00:01 +0000Coded Hundred SquareThis 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?http://nrich.maths.org/6554Tue, 01 Feb 2011 00:00:01 +0000Cubes Here and ThereHow many shapes can you build from three red and two green cubes? Can you use what you've found out to predict the number for four red and two green?http://nrich.maths.org/6119Tue, 01 Feb 2011 00:00:01 +0000Picture a Pyramid ...Imagine a pyramid which is built in square layers of small cubes. If we number the cubes from the top, starting with 1, can you picture which cubes are directly below this first cube?http://nrich.maths.org/5809Tue, 01 Feb 2011 00:00:01 +0000Shape Times ShapeThese eleven shapes each stand for a different number. Can you use the multiplication sums to work out what they are?http://nrich.maths.org/5714Tue, 01 Feb 2011 00:00:01 +0000Balance of HalvesInvestigate this balance which is marked in halves. If you had a weight on the left-hand 7, where could you hang two weights on the right to make it balance?http://nrich.maths.org/5677Tue, 01 Feb 2011 00:00:01 +0000Four GoThis challenge is a game for two players. Choose two numbers from the grid and multiply or divide, then mark your answer on the number line. Can you get four in a row before your partner?http://nrich.maths.org/5633Tue, 01 Feb 2011 00:00:01 +0000Brush LoadsHow can you arrange the 5 cubes so that you need the smallest number of Brush Loads of paint to cover them? Try with other numbers of cubes as well.http://nrich.maths.org/4911Tue, 01 Feb 2011 00:00:01 +0000Up and Down StaircasesOne block is needed to make an up-and-down staircase, with one step up and one step down. How many blocks would be needed to build an up-and-down staircase with 5 steps up and 5 steps down?http://nrich.maths.org/2283Tue, 01 Feb 2011 00:00:01 +0000TotalityThis is an adding game for two players.http://nrich.maths.org/1216Tue, 01 Feb 2011 00:00:01 +0000Plenty of PensAmy's mum had given her £2.50 to spend. She bought four times as many pens as pencils and was given 40p change. How many of each did she buy?http://nrich.maths.org/1117Tue, 01 Feb 2011 00:00:01 +0000Mystery MatrixCan you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.http://nrich.maths.org/1070Tue, 01 Feb 2011 00:00:01 +0000Super ShapesThe value of the circle changes in each of the following problems.
Can you discover its value in each problem?http://nrich.maths.org/1056Tue, 01 Feb 2011 00:00:01 +0000Amy's DominoesAmy has a box containing domino pieces but she does not think it is a complete set. She has 24 dominoes in her box and there are 125 spots on them altogether. Which of her domino pieces are missing?http://nrich.maths.org/1044Tue, 01 Feb 2011 00:00:01 +0000Maze 100Can you go through this maze so that the numbers you pass add to exactly 100?http://nrich.maths.org/91Tue, 01 Feb 2011 00:00:01 +0000Sticky TrianglesCan you continue this pattern of triangles and begin to predict how many sticks are used for each new "layer"?http://nrich.maths.org/88Tue, 01 Feb 2011 00:00:01 +0000