### Two Stones

### Air Nets

### Matching Fractions, Decimals and Percentages

### Factors and Multiples Game

A game in which players take it in turns to choose a number. Can you block your opponent?

### Twinkle Twinkle

### More Less is More

### Prime Magic

### Colour in the Square

### Dominoes

### Got It

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.

### Remainders

### Pentanim

### Low Go

### Fifteen

Can you spot the similarities between this game and other games you know? The aim is to choose 3 numbers that total 15.

### Two and Two

How many solutions can you find to this sum? Each of the different letters stands for a different number.

### Domino Magic Rectangle

An ordinary set of dominoes can be laid out as a 7 by 4 magic rectangle in which all the spots in all the columns add to 24, while those in the rows add to 42. Try it! Now try the magic square...

### Tea Cups

### Eight Dominoes

### American Billions

### Sociable Cards

### What numbers can we make?

Imagine we have four bags containing a large number of 1s, 4s, 7s and 10s. What numbers can we make?

### Olympic Records

### Can they be equal?

### Odds, Evens and More Evens

Alison, Bernard and Charlie have been exploring sequences of odd and even numbers, which raise some intriguing questions...

### Multiples Sudoku

### Magic Letters

### Sticky Numbers

### Olympic Measures

### What's it worth?

There are lots of different methods to find out what the shapes are worth - how many can you find?

### Frogs

### Forwards Add Backwards

### Reflecting Squarely

In how many ways can you fit all three pieces together to make shapes with line symmetry?

### Cinema Problem

A cinema has 100 seats. How can ticket sales make Â£100 for these different combinations of ticket prices?

### Colourful Cube

### Shady Symmetry

### Gabriel's Problem

### Special Numbers

My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?

### Dicey Operations

Who said that adding, subtracting, multiplying and dividing couldn't be fun?

### Square It

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.

### Consecutive Seven

### Substitution Cipher

### Take Ten Sticks

### Factors and Multiples Puzzle

### Cayley

### Fractions jigsaw

### 3388

### Temperature

### Connect Three

### Always a multiple?

### crossing the bridge

### Zin Obelisk

### Opposite vertices

Can you recreate squares and rhombuses if you are only given a side or a diagonal?

### Marbles in a box

### 1 Step 2 Step

### Making Rectangles, Making Squares

### Tower of Hanoi

### Overlaps

### Bow Tie

### Fibonacci Surprises

Play around with the Fibonacci sequence and discover some surprising results!

### Take Three From Five

Caroline and James pick sets of five numbers. Charlie tries to find three that add together to make a multiple of three. Can they stop him?

### Last Biscuit

Can you find a strategy that ensures you get to take the last biscuit in this game?

### Peaches today, Peaches tomorrow...

### Squares in rectangles

### Product Sudoku

The clues for this Sudoku are the product of the numbers in adjacent squares.

### Where can we visit?

### Route to infinity

### Domino tetrads

### One, Three, Five, Seven

### Tourism

### Cuboids

### Instant Insanity

Given the nets of 4 cubes with the faces coloured in 4 colours, build a tower so that on each vertical wall no colour is repeated, that is all 4 colours appear.