Choose a symbol to put into the number sentence.
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
Place six toy ladybirds into the box so that there are two ladybirds in every column and every row.
This problem is based on a code using two different prime numbers less than 10. You'll need to multiply them together and shift the alphabet forwards by the result. Can you decipher the code?
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.
Use the clues to colour each square.
Here are some rods that are different colours. How could I make a yellow rod using white and red rods?
There 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?
How many trains can you make which are the same length as Matt's and Katie's, using rods that are identical?
Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
Start by putting one million (1 000 000) into the display of your calculator. Can you reduce this to 7 using just the 7 key and add, subtract, multiply, divide and equals as many times as you like?
First Connect Three game for an adult and child. Use the dice numbers and either addition or subtraction to get three numbers in a straight line.
Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
A game to be played against the computer, or in groups. Pick a 7-digit number. A random digit is generated. What must you subract to remove the digit from your number? the first to zero wins.
You have 4 red and 5 blue counters. How many ways can they be placed on a 3 by 3 grid so that all the rows columns and diagonals have an even number of red counters?
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
Practise your number bonds whilst improving your memory in this matching pairs game.
Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?
An interactive activity for one to experiment with a tricky tessellation
A game for two people that can be played with pencils and paper. Combine your knowledge of coordinates with some strategic thinking.
Calculate the fractional amounts of money to match pairs of cards with the same value.
How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
A game for 2 players that can be played online. Players take it in turns to select a word from the 9 words given. The aim is to select all the occurrences of the same letter.
An interactive game to be played on your own or with friends. Imagine you are having a party. Each person takes it in turns to stand behind the chair where they will get the most chocolate.
Stop the Clock game for an adult and child. How can you make sure you always win this game?
Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?
Can you match the halves in this interactive game?
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
Practise your tables skills and try to beat your previous best score in this interactive game.
A train building game for two players. Can you be the one to complete the train?
Train game for an adult and child. Who will be the first to make the train?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Can you complete this jigsaw of the multiplication square?
A card pairing game involving knowledge of simple ratio.
There are three versions of this challenge. The idea is to change the colour of all the spots on the grid. Can you do it in fewer throws of the dice?
Use your mouse to move the red and green parts of this disc. Can you make images which show the turnings described?
Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?
Here is a chance to play a version of the classic Countdown Game.
Sort the houses in my street into different groups. Can you do it in any other ways?
Watch this film carefully. Can you find a general rule for explaining when the dot will be this same distance from the horizontal axis?