Ben and his mum are planting garlic. Use the interactivity to help
you find out how many cloves of garlic they might have had.
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
How many trains can you make which are the same length as Matt's,
using rods that are identical?
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?
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?
Find out what a "fault-free" rectangle is and try to make some of
Here is a chance to play a version of the classic Countdown Game.
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?
Place the numbers 1 to 10 in the circles so that each number is the
difference between the two numbers just below 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?
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....?
Place the numbers 1 to 6 in the circles so that each number is the
difference between the two numbers just below it.
An environment which simulates working with Cuisenaire rods.
Place six toy ladybirds into the box so that there are two
ladybirds in every column and every row.
Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
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?
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
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?
Can you put the 25 coloured tiles into the 5 x 5 square so that no
column, no row and no diagonal line have tiles of the same colour
Can you put the numbers 1 to 8 into the circles so that the four
calculations are correct?
Choose four of the numbers from 1 to 9 to put in the squares so
that the differences between joined squares are odd.
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?
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?
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
Can you hang weights in the right place to make the equaliser
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?
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10
How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
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
Use the interactivity to find all the different right-angled
triangles you can make by just moving one corner of the starting
This article gives you a few ideas for understanding the Got It! game and how you might find a winning strategy.
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
How many different ways can you find to join three equilateral
triangles together? Can you convince us that you have found them
What happens when you try and fit the triomino pieces into these
Can you cover the camel with these pieces?
How many different triangles can you make on a circular pegboard
that has nine pegs?
How have the numbers been placed in this Carroll diagram? Which
labels would you put on each row and column?
Can you find all the different triangles on these peg boards, and
find their angles?
How many different rhythms can you make by putting two drums on the
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!
This 100 square jigsaw is written in code. It starts with 1 and
ends with 100. Can you build it up?
Use the clues to colour each square.
Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?
Our 2008 Advent Calendar has a 'Making Maths' activity for every
day in the run-up to Christmas.
The idea of this game is to add or subtract the two numbers on the
dice and cover the result on the grid, trying to get a line of
three. Are there some numbers that are good to aim for?
Can you put the numbers from 1 to 15 on the circles so that no
consecutive numbers lie anywhere along a continuous straight line?
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?
Cut four triangles from a square as shown in the picture. How many
different shapes can you make by fitting the four triangles back
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?