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?
Can you complete this jigsaw of the multiplication square?
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....?
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
How have the numbers been placed in this Carroll diagram? Which labels would you put on each row and column?
Can you hang weights in the right place to make the equaliser balance?
Place 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?
Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?
Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10 will be?
Can you find all the different ways of lining up these Cuisenaire rods?
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
Use the information about Sally and her brother to find out how many children there are in the Brown family.
An odd version of tic tac toe
What happens when you try and fit the triomino pieces into these two grids?
Can you cover the camel with these pieces?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Hover your mouse over the counters to see which ones will be removed. Click to remover them. The winner is the last one to remove a counter. How you can make sure you win?
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
If there are 3 squares in the ring, can you place three different numbers in them so that their differences are odd? Try with different numbers of squares around the ring. What do you notice?
If you have only four weights, where could you place them in order to balance this equaliser?
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.
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?
Use the number weights to find different ways of balancing the equaliser.
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
Can you make a cycle of pairs that add to make a square number using all the numbers in the box below, once and once only?
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?
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
Choose a symbol to put into the number sentence.
Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?
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?
Make one big triangle so the numbers that touch on the small triangles add to 10. You could use the interactivity to help you.
Starting with the number 180, take away 9 again and again, joining up the dots as you go. Watch out - don't join all the dots!
Use the clues to colour each square.
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?
Use the interactivities to complete these Venn diagrams.
Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
Exchange the positions of the two sets of counters in the least possible number of moves
Train game for an adult and child. Who will be the first to make the train?
Move just three of the circles so that the triangle faces in the opposite direction.
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
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.
A game for 2 people that everybody knows. You can play with a friend or online. If you play correctly you never lose!
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
An interactive activity for one to experiment with a tricky tessellation
A game for 2 people that can be played on line or with pens and paper. Combine your knowledege of coordinates with your skills of strategic thinking.
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?
How many different rhythms can you make by putting two drums on the wheel?