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?
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.
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.
If you hang two weights on one side of this balance, in how many different ways can you hang three weights on the other side for it to be balanced?
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
In your bank, you have three types of coins. The number of spots shows how much they are worth. Can you choose coins to exchange with the groups given to make the same total?
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10 will be?
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
Use the clues to colour each square.
Choose a symbol to put into the number sentence.
Can you make a train the same length as Laura's but using three differently coloured rods? Is there only one way of doing it?
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?
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?
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
Terry and Ali are playing a game with three balls. Is it fair that Terry wins when the middle ball is red?
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
Use your mouse to move the red and green parts of this disc. Can you make images which show the turnings described?
Can you work out how to balance this equaliser? You can put more than one weight on a hook.
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
Sort the houses in my street into different groups. Can you do it in any other ways?
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?
A tetromino is made up of four squares joined edge to edge. Can this tetromino, together with 15 copies of itself, be used to cover an eight by eight chessboard?
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
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....?
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?
Find out how we can describe the "symmetries" of this triangle and investigate some combinations of rotating and flipping it.
Can you find all the different triangles on these peg boards, and find their angles?
How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
Hover your mouse over the counters to see which ones will be removed. Click to remove them. The winner is the last one to remove a counter. How you can make sure you win?
How many trains can you make which are the same length as Matt's, using rods that are identical?
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?
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
Interactive game. Set your own level of challenge, practise your table skills and beat your previous best score.
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
Try out the lottery that is played in a far-away land. What is the chance of winning?
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
An environment which simulates working with Cuisenaire rods.
Here is a chance to play a version of the classic Countdown Game.
What happens when you try and fit the triomino pieces into these two grids?
Can you cover the camel with these pieces?
Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
If you have only four weights, where could you place them in order to balance this equaliser?
How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?
A game for 1 or 2 people. Use the interactive version, or play with friends. Try to round up as many counters as possible.
A game for two people that can be played with pencils and paper. Combine your knowledge of coordinates with some strategic thinking.
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.
Incey Wincey Spider game for an adult and child. Will Incey get to the top of the drainpipe?
Stop the Clock game for an adult and child. How can you make sure you always win this game?