This challenge is about finding the difference between numbers which have the same tens digit.

Can you work out how to balance this equaliser? You can put more than one weight on a hook.

Can you work out the domino pieces which would go in the middle in each case to complete the pattern of these eight sets of 3 dominoes?

There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. Can you use the information given to find out how many eggs are in each basket?

Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.

Start with three pairs of socks. Now mix them up so that no mismatched pair is the same as another mismatched pair. Is there more than one way to do it?

My coat has three buttons. How many ways can you find to do up all the buttons?

In this problem it is not the squares that jump, you do the jumping! The idea is to go round the track in as few jumps as possible.

What could the half time scores have been in these Olympic hockey matches?

You have a set of the digits from 0 – 9. Can you arrange these in the 5 boxes to make two-digit numbers as close to the targets as possible?

Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?

How could you put these three beads into bags? How many different ways can you do it? How could you record what you've done?

Can you work out how many flowers there will be on the Amazing Splitting Plant after it has been growing for six weeks?

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?

Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?

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

How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?

How many different triangles can you draw on the dotty grid which each have one dot in the middle?

My cube has inky marks on each face. Can you find the route it has taken? What does each face look like?

Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.

In this town, houses are built with one room for each person. There are some families of seven people living in the town. In how many different ways can they build their houses?

Try this matching game which will help you recognise different ways of saying the same time interval.

There were chews for 2p, mini eggs for 3p, Chocko bars for 5p and lollypops for 7p in the sweet shop. What could each of the children buy with their money?

Throw the dice and decide whether to double or halve the number. Will you be the first to reach the target?

Complete the squares - but be warned some are trickier than they look!

Frances and Rishi were given a bag of lollies. They shared them out evenly and had one left over. How many lollies could there have been in the bag?

Use the interactivity to find out how many quarter turns the man must rotate through to look like each of the pictures.

Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.

At the beginning of May Tom put his tomato plant outside. On the same day he sowed a bean in another pot. When will the two be the same height?

Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

Use the information about Sally and her brother to find out how many children there are in the Brown family.

An environment which simulates working with Cuisenaire rods.

Can you hang weights in the right place to make the equaliser balance?

Can you use the numbers on the dice to reach your end of the number line before your partner beats you?

How many possible necklaces can you find? And how do you know you've found them all?

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

Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?

"Ip dip sky blue! Who's 'it'? It's you!" Where would you position yourself so that you are 'it' if there are two players? Three players ...?

This activity is best done with a whole class or in a large group. Can you match the cards? What happens when you add pairs of the numbers together?

Ram divided 15 pennies among four small bags. He could then pay any sum of money from 1p to 15p without opening any bag. How many pennies did Ram put in each bag?

Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?

Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?