60Primary Teacher big button pagehttp://nrich.maths.org/8697en 2012 https://nrich.maths.org/public/terms.phpNext-door NumbersFlorence, Ethan and Alma have each added together two 'next-door' numbers. What is the same about their answers?https://nrich.maths.org/13665Wed, 01 Dec 1999 00:00:01 +0000Pouring ProblemWhat do you think is going to happen in this video clip? Are you surprised?https://nrich.maths.org/13664Wed, 01 Dec 1999 00:00:01 +0000Square SurpriseWhy do you think that the red player chose that particular dot in this game of Square It?https://nrich.maths.org/13662Wed, 01 Dec 1999 00:00:01 +0000Getting into and staying in the Growth ZoneIn this article for teachers, Clare Lee and Sue Johnston-Wilder explain how the Growth Zone model can help develop resilience in our learners.https://nrich.maths.org/13491Wed, 01 Dec 1999 00:00:01 +0000Number Lines in DisguiseSome of the numbers have fallen off Becky's number line. Can you figure out what they were?https://nrich.maths.org/13452Wed, 01 Dec 1999 00:00:01 +0000I Wonder ...?https://nrich.maths.org/13436Wed, 01 Dec 1999 00:00:01 +0000Satisfying 4 StatementsCan you find any two-digit numbers that satisfy all of these statements?https://nrich.maths.org/13377Wed, 01 Dec 1999 00:00:01 +0000CodebreakersThis article for Primary and Secondary teachers is all about the mathematics behind solving puzzles, unravelling mysteries and breaking codes.https://nrich.maths.org/13332Wed, 01 Dec 1999 00:00:01 +0000What's the Problem with Problem Solving?Becoming a mathematical problem solver really is the point of doing mathematics, so this article offers ideas and strategies to ensure that every lesson can be a problem solving lesson.https://nrich.maths.org/13242Wed, 01 Dec 1999 00:00:01 +0000NRICH at Every StageWhether you are reflecting on the mathematical developments children have made over the year, or thinking about activities for a transition day this article offers plenty of ideas and tasks to support you.https://nrich.maths.org/13182Wed, 01 Dec 1999 00:00:01 +0000Subtraction SurpriseTry out some calculations. Are you surprised by the results?https://nrich.maths.org/11014Wed, 01 Dec 1999 00:00:01 +0000Count the CrayonsHow could you estimate the number of pencils/pens in these pictures?https://nrich.maths.org/10653Sun, 01 Dec 2013 00:00:01 +0000Build it UpCan you find all the ways to get 15 at the top of this triangle of numbers?https://nrich.maths.org/10592Wed, 01 Dec 1999 00:00:01 +0000What Could It Be?In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?https://nrich.maths.org/10479Tue, 01 Oct 2013 00:00:01 +0100How Would We Count?An activity centred around observations of dots and how we visualise number arrangement patterns.https://nrich.maths.org/8123Tue, 01 May 2012 00:00:01 +0100Take Three NumbersWhat happens when you add three numbers together? Will your answer be odd or even? How do you know?https://nrich.maths.org/8063Sun, 01 Apr 2012 00:00:01 +0100What Was in the Box?This big box adds something to any number that goes into it. If you know the numbers that come out, what addition might be going on in the box?https://nrich.maths.org/7819Tue, 01 Feb 2011 00:00:01 +0000Using Low Threshold High Ceiling TasksThis article explores what LTHC tasks are and why they are a firm favourite here at NRICH. We recommend that you start by reading the article to understand what makes a task LTHC and then delve into some of the activities we have selected.https://nrich.maths.org/7701Fri, 01 Jul 2011 00:00:01 +0100Poly Plug RectanglesThe computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?https://nrich.maths.org/7511Wed, 01 Jun 2011 00:00:01 +0100Count the DigitsIn this investigation we are going to count the number of 1s, 2s, 3s etc in numbers. Can you predict what will happen?https://nrich.maths.org/7302Tue, 01 Feb 2011 00:00:01 +0000Curious NumberCan you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?https://nrich.maths.org/7218Tue, 01 Feb 2011 00:00:01 +0000How OddThis problem challenges you to find out how many odd numbers there are between pairs of numbers. Can you find a pair of numbers that has four odds between them?https://nrich.maths.org/7190Tue, 01 Feb 2011 00:00:01 +0000Light the LightsInvestigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?https://nrich.maths.org/7044Tue, 01 Feb 2011 00:00:01 +0000I Like ...Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?https://nrich.maths.org/6962Tue, 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?https://nrich.maths.org/6554Tue, 01 Feb 2011 00:00:01 +0000HolesI've made some cubes and some cubes with holes in. This challenge invites you to explore the difference in the number of small cubes I've used. Can you see any patterns?https://nrich.maths.org/6529Tue, 01 Feb 2011 00:00:01 +0000Magic VsCan you put the numbers 1-5 in the V shape so that both 'arms' have the same total?https://nrich.maths.org/6274Tue, 01 Feb 2011 00:00:01 +0000Find the DifferencePlace the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.https://nrich.maths.org/6227Tue, 01 Feb 2011 00:00:01 +0000CaterpillarsThese caterpillars have 16 parts. What different shapes do they make if each part lies in the small squares of a 4 by 4 square?https://nrich.maths.org/5742Tue, 01 Feb 2011 00:00:01 +0000Secret NumberAnnie and Ben are playing a game with a calculator. What was Annie's secret number?https://nrich.maths.org/5651Tue, 01 Feb 2011 00:00:01 +0000Inside TrianglesHow many different triangles can you draw on the dotty grid which each have one dot in the middle?https://nrich.maths.org/5648Tue, 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?https://nrich.maths.org/5633Tue, 01 Feb 2011 00:00:01 +0000Making Maths: Birds from an EggCan you make the birds from the egg tangram?https://nrich.maths.org/5356Tue, 01 Feb 2011 00:00:01 +0000Sort the StreetSort the houses in my street into different groups. Can you do it in any other ways?https://nrich.maths.org/5157Tue, 01 Feb 2011 00:00:01 +0000Same Length TrainsHow many trains can you make which are the same length as Matt's, using rods that are identical?https://nrich.maths.org/4332Tue, 01 Feb 2011 00:00:01 +0000Number DifferencesPlace the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?https://nrich.maths.org/2790Tue, 01 Feb 2011 00:00:01 +0000Stone Age CountingWhat could these drawings, found in a cave in Spain, represent?https://nrich.maths.org/2472Tue, 01 Feb 2011 00:00:01 +0000Break it Up!In how many different ways can you break up a stick of 7 interlocking cubes? Now try with a stick of 8 cubes and a stick of 6 cubes.https://nrich.maths.org/2284Tue, 01 Feb 2011 00:00:01 +0000Pass the Peas, PleaseA game for 2 or more players. Practise your addition and subtraction with the aid of a game board and some dried peas!https://nrich.maths.org/1247Tue, 01 Feb 2011 00:00:01 +0000Money BagsRam divided 15 pennies among four small bags. He could then pay any sum of money from 1p to 15p without opening any bag. How many pennies did Ram put in each bag?https://nrich.maths.org/1116Tue, 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.https://nrich.maths.org/1070Tue, 01 Feb 2011 00:00:01 +0000Twenty Divided Into SixKatie had a pack of 20 cards numbered from 1 to 20. She arranged the cards into 6 unequal piles where each pile added to the same total. What was the total and how could this be done?https://nrich.maths.org/1047Tue, 01 Feb 2011 00:00:01 +0000Creating CubesArrange 9 red cubes, 9 blue cubes and 9 yellow cubes into a large 3 by 3 cube. No row or column of cubes must contain two cubes of the same colour.https://nrich.maths.org/1027Tue, 01 Feb 2011 00:00:01 +0000Zios and ZeptsOn the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?https://nrich.maths.org/1005Tue, 01 Feb 2011 00:00:01 +0000What Number?I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.https://nrich.maths.org/984Tue, 01 Feb 2011 00:00:01 +0000Highest and LowestPut operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.https://nrich.maths.org/943Tue, 01 Feb 2011 00:00:01 +0000Heads and FeetOn a farm there were some hens and sheep. Altogether there were 8 heads and 22 feet. How many hens were there?https://nrich.maths.org/924Tue, 01 Feb 2011 00:00:01 +0000Which Scripts?There are six numbers written in five different scripts. Can you sort out which is which?https://nrich.maths.org/774Tue, 01 Feb 2011 00:00:01 +0000Number SandwichesCan you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?https://nrich.maths.org/522Tue, 01 Feb 2011 00:00:01 +0000Number DetectiveFollow the clues to find the mystery number.https://nrich.maths.org/204Tue, 01 Feb 2011 00:00:01 +0000Domino SquareUse the 'double-3 down' dominoes to make a square so that each side has eight dots.https://nrich.maths.org/146Tue, 01 Feb 2011 00:00:01 +0000Ladybird BoxPlace six toy ladybirds into the box so that there are two ladybirds in every column and every row.https://nrich.maths.org/144Tue, 01 Feb 2011 00:00:01 +0000Four Triangles PuzzleCut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?https://nrich.maths.org/141Tue, 01 Feb 2011 00:00:01 +0000NoahNoah saw 12 legs walk by into the Ark. How many creatures did he see?https://nrich.maths.org/136Tue, 01 Feb 2011 00:00:01 +0000Teddy TownThere are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?https://nrich.maths.org/108Tue, 01 Feb 2011 00:00:01 +0000Maze 100Can you go through this maze so that the numbers you pass add to exactly 100?https://nrich.maths.org/91Tue, 01 Feb 2011 00:00:01 +0000Sweets in a BoxHow many different shaped boxes can you design for 36 sweets in one layer? Can you arrange the sweets so that no sweets of the same colour are next to each other in any direction?https://nrich.maths.org/84Tue, 01 Feb 2011 00:00:01 +0000WormsPlace this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?https://nrich.maths.org/40Tue, 01 Feb 2011 00:00:01 +0000Tea CupsPlace the 16 different combinations of cup/saucer in this 4 by 4 arrangement so that no row or column contains more than one cup or saucer of the same colour.https://nrich.maths.org/32Tue, 01 Feb 2011 00:00:01 +0000Consecutive NumbersAn investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.https://nrich.maths.org/31Tue, 01 Feb 2011 00:00:01 +0000Prompt CardsThese two group activities use mathematical reasoning - one is numerical, one geometric.https://nrich.maths.org/23Tue, 01 Feb 2011 00:00:01 +0000TangramsCan you make five differently sized squares from the tangram pieces?https://nrich.maths.org/1Tue, 01 Feb 2011 00:00:01 +0000