An environment which simulates working with Cuisenaire rods.
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?
How many trains can you make which are the same length as Matt's, using rods that are identical?
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
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?
Can you find all the different ways of lining up these Cuisenaire
Use the information about Sally and her brother to find out how many children there are in the Brown family.
What happens when you try and fit the triomino pieces into these
Can you hang weights in the right place to make the equaliser
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....?
Can you cover the camel with these pieces?
Match the halves.
Can you use the numbers on the dice to reach your end of the number line before your partner beats you?
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
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 interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
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!
Make one big triangle so the numbers that touch on the small triangles add to 10. You could use the interactivity to help you.
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
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?
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?
Ben and his mum are planting garlic. Use the interactivity to help
you find out how many cloves of garlic they might have had.
Can you complete this jigsaw of the multiplication square?
Find out what a "fault-free" rectangle is and try to make some of
Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
Can you put the numbers 1 to 8 into the circles so that the four
calculations are correct?
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 train building game for 2 players.
Here is a chance to play a version of the classic Countdown Game.
Choose a symbol to put into the number sentence.
Use the number weights to find different ways of balancing the equaliser.
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
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?
Investigate the different sounds you can make by putting the owls
and donkeys on the wheel.
Cut four triangles from a square as shown in the picture. How many
different shapes can you make by fitting the four triangles back
Place six toy ladybirds into the box so that there are two ladybirds in every column and every row.
Train game for an adult and child. Who will be the first to make the train?
Use the clues to colour each square.
Try out the lottery that is played in a far-away land. What is the
chance of winning?
Place the numbers 1 to 6 in the circles so that each number is the
difference between the two numbers just below it.
If you have only four weights, where could you place them in order
to balance this equaliser?
Place the numbers 1 to 10 in the circles so that each number is the
difference between the two numbers just below it.
Complete the squares - but be warned some are trickier than they
Terry and Ali are playing a game with three balls. Is it fair that
Terry wins when the middle ball is red?
An interactive activity for one to experiment with a tricky tessellation
Using angular.js to bind inputs to outputs
A variant on the game Alquerque