Watch the video of Fran re-ordering these number cards. What do you notice? Try it for yourself. What happens?

How many legs do each of these creatures have? How many pairs is that?

While musing about the difficulties children face in comprehending number structure, notation, etc., it occured to the author that there is a vast array of occasions when numbers and signs are used. . . .

Take a look at the video of this trick. Can you perform it yourself? Why is this maths and not magic?

25 students are queuing in a straight line. How many are there between Julia and Jenny?

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?

What could these drawings, found in a cave in Spain, represent?

Jack's mum bought some candles to use on his birthday cakes and when his sister was born, she used them on her cakes too. Can you use the information to find out when Kate was born?

Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?

Helen Joyce interviews the neuropsychologist Brian Butterworth whose research has shown that we are all born with a "built-in" sense of cardinal number.

This problem challenges you to find out how many odd numbers there are between pairs of numbers. Can you find a pair of numbers that has four odds between them?

This is a game in which your counters move in a spiral round the snail's shell. It is about understanding tens and units.

Ruth Trundley outlines her doctoral research and concludes that development of an understanding of cardinality is a crucial element of counting that can be overlooked.

What do you see as you watch this video? Can you create a similar video for the number 12?

Buzzy Bee was building a honeycomb. She decorated the honeycomb with a pattern using numbers. Can you discover Buzzy's pattern and fill in the empty cells for her?

This article for pupils explores what makes numbers special or lucky, and looks at the numbers that are all around us every day.

Daisy and Akram were making number patterns. Daisy was using beads that looked like flowers and Akram was using cube bricks. First they were counting in twos.

How could you estimate the number of pencils/pens in these pictures?

Find the words hidden inside each of the circles by counting around a certain number of spaces to find each letter in turn.

Can you work out how many apples there are in this fruit bowl if you know what fraction there are?

Can you find a path from a number at the top of this network to the bottom which goes through each number from 1 to 9 once and once only?

Some children were playing a game. Make a graph or picture to show how many ladybirds each child had.

Dotty Six is a simple dice game that you can adapt in many ways.

How would you count the number of fingers in these pictures?

Solve this Sudoku puzzle whose clues are in the form of sums of the numbers which should appear in diagonal opposite cells.

Nim-7 game for an adult and child. Who will be the one to take the last counter?

Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.

If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?

Place the numbers 1 to 8 in the circles so that no consecutive numbers are joined by a line.

Dotty Six game for an adult and child. Will you be the first to have three sixes in a straight line?

In this game, you can add, subtract, multiply or divide the numbers on the dice. Which will you do so that you get to the end of the number line first?

Can you each work out the number on your card? What do you notice? How could you sort the cards?

Kimie and Sebastian were making sticks from interlocking cubes and lining them up. Can they make their lines the same length? Can they make any other lines?

Can you work out how to win this game of Nim? Does it matter if you go first or second?

Incey Wincey Spider game for an adult and child. Will Incey get to the top of the drainpipe?

A game for two people, who take turns to move the counters. The player to remove the last counter from the board wins.

Here is a version of the game 'Happy Families' for you to make and play.

In this problem, we're investigating the number of steps we would climb up or down to get out of or into the swimming pool. How could you number the steps below the water?

Investigate the different ways these aliens count in this challenge. You could start by thinking about how each of them would write our number 7.

You'll need two dice to play this game against a partner. Will Incey Wincey make it to the top of the drain pipe or the bottom of the drain pipe first?

In a square in which the houses are evenly spaced, numbers 3 and 10 are opposite each other. What is the smallest and what is the largest possible number of houses in the square?

This challenge involves calculating the number of candles needed on birthday cakes. It is an opportunity to explore numbers and discover new things.

Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?