Here are some arrangements of circles. How many circles would I need to make the next size up for each? Can you create your own arrangement and investigate the number of circles it needs?
In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.
The NRICH team are always looking for new ways to engage teachers and pupils in problem solving. Here we explain the thinking behind maths trails.
How many ways can you find to do up all four buttons on my coat? How about if I had five buttons? Six ...?
Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.
Only one side of a two-slice toaster is working. What is the quickest way to toast both sides of three slices of bread?
Got It game for an adult and child. How can you play so that you know you will always win?
Nim-7 game for an adult and child. Who will be the one to take the last counter?
Strike it Out game for an adult and child. Can you stop your partner from being able to go?
Stop the Clock game for an adult and child. How can you make sure you always win this game?
Think of a number, square it and subtract your starting number. Is the number you’re left with odd or even? How do the images help to explain this?
This article for teachers describes several games, found on the site, all of which have a related structure that can be used to develop the skills of strategic planning.
In each of the pictures the invitation is for you to: Count what you see. Identify how you think the pattern would continue.
A game for 2 players with similarities to NIM. Place one counter on each spot on the games board. Players take it is turns to remove 1 or 2 adjacent counters. The winner picks up the last counter.
Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.
An article for teachers and pupils that encourages you to look at the mathematical properties of similar games.
Can you work out how to win this game of Nim? Does it matter if you go first or second?
Watch this film carefully. Can you find a general rule for explaining when the dot will be this same distance from the horizontal axis?
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
This task encourages you to investigate the number of edging pieces and panes in different sized windows.
Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.
Take a look at the video of this trick. Can you perform it yourself? Why is this maths and not magic?
Can you dissect an equilateral triangle into 6 smaller ones? What number of smaller equilateral triangles is it NOT possible to dissect a larger equilateral triangle into?
Watch this animation. What do you see? Can you explain why this happens?
Surprise your friends with this magic square trick.
Find the sum and difference between a pair of two-digit numbers. Now find the sum and difference between the sum and difference! What happens?
Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?
This challenge focuses on finding the sum and difference of pairs of two-digit numbers.
Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.
Tom and Ben visited Numberland. Use the maps to work out the number of points each of their routes scores.
This challenge is about finding the difference between numbers which have the same tens digit.
Compare the numbers of particular tiles in one or all of these three designs, inspired by the floor tiles of a church in Cambridge.
In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?
Polygonal numbers are those that are arranged in shapes as they enlarge. Explore the polygonal numbers drawn here.
It starts quite simple but great opportunities for number discoveries and patterns!
Investigate the different ways that fifteen schools could have given money in a charity fundraiser.
This challenge, written for the Young Mathematicians' Award, invites you to explore 'centred squares'.
These squares have been made from Cuisenaire rods. Can you describe the pattern? What would the next square look like?
This task follows on from Build it Up and takes the ideas into three dimensions!
Can you continue this pattern of triangles and begin to predict how many sticks are used for each new "layer"?
Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?
While we were sorting some papers we found 3 strange sheets which seemed to come from small books but there were page numbers at the foot of each page. Did the pages come from the same book?
Four bags contain a large number of 1s, 3s, 5s and 7s. Pick any ten numbers from the bags above so that their total is 37.
Can you find a way of counting the spheres in these arrangements?
Take a counter and surround it by a ring of other counters that MUST touch two others. How many are needed?
Can you make dice stairs using the rules stated? How do you know you have all the possible stairs?
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.
A collection of games on the NIM theme
Frances and Rishi were given a bag of lollies. They shared them out evenly and had one left over. How many lollies could there have been in the bag?
Watch this video to see how to roll the dice. Now it's your turn! What do you notice about the dice numbers you have recorded?