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

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?

In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?

How many trains can you make which are the same length as Matt's, using rods that are identical?

Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?

There are three versions of this challenge. The idea is to change the colour of all the spots on the grid. Can you do it in fewer throws of the dice?

Yasmin and Zach have some bears to share. Which numbers of bears can they share so that there are none left over?

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?

Use the number weights to find different ways of balancing the equaliser.

Try grouping the dominoes in the ways described. Are there any left over each time? Can you explain why?

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?

Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

Use your mouse to move the red and green parts of this disc. Can you make images which show the turnings described?

Using the cards 2, 4, 6, 8, +, - and =, what number statements can you make?

Make one big triangle so the numbers that touch on the small triangles add to 10. You could use the interactivity to help you.

Find all the numbers that can be made by adding the dots on two dice.

Try this version of Snap with a friend - do you know the order of the days of the week?

Can you find 2 butterflies to go on each flower so that the numbers on each pair of butterflies adds to the same number as the one on the flower?

Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?

What does the overlap of these two shapes look like? Try picturing it in your head and then use the interactivity to test your prediction.

As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

A group of children are discussing the height of a tall tree. How would you go about finding out its height?

Can you see who the gold medal winner is? What about the silver medal winner and the bronze medal winner?

Try continuing these patterns made from triangles. Can you create your own repeating pattern?

If you split the square into these two pieces, it is possible to fit the pieces together again to make a new shape. How many new shapes can you make?

These pictures show some different activities that you may get up to during a day. What order would you do them in?

Can you split each of the shapes below in half so that the two parts are exactly the same?

These pictures show squares split into halves. Can you find other ways?

Can you put these shapes in order of size? Start with the smallest.

Use these head, body and leg pieces to make Robot Monsters which are different heights.

In this investigation we are going to count the number of 1s, 2s, 3s etc in numbers. Can you predict what will happen?

Leah and Tom each have a number line. Can you work out where their counters will land? What are the secret jumps they make with their counters?

In this activity focusing on capacity, you will need a collection of different jars and bottles.

For this activity which explores capacity, you will need to collect some bottles and jars.

A simple visual exploration into halving and doubling.

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

Here is a picnic that Petros and Michael are going to share equally. Can you tell us what each of them will have?

Try some throwing activities and see whether you can throw something as far as the Olympic hammer or discus throwers.

These pictures were made by starting with a square, finding the half-way point on each side and joining those points up. You could investigate your own starting shape.

This problem is intended to get children to look really hard at something they will see many times in the next few months.

The red ring is inside the blue ring in this picture. Can you rearrange the rings in different ways? Perhaps you can overlap them or put one outside another?

Here are some short problems for you to try. Talk to your friends about how you work them out.

Can you each work out what shape you have part of on your card? What will the rest of it look like?

Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?

One day five small animals in my garden were going to have a sports day. They decided to have a swimming race, a running race, a high jump and a long jump.

Here's a very elementary code that requires young children to read a table, and look for similarities and differences.