Or search by topic
Can you find out which 3D shape your partner has chosen before they work out your shape?
Can you put these four calculations into order of difficulty? How did you decide?
Order these four calculations from easiest to hardest. How did you decide?
Use your knowledge of place value to try to win this game. How will you maximise your score?
The Number Jumbler can always work out your chosen symbol. Can you work out how?
Try out this number trick. What happens with different starting numbers? What do you notice?
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
Some of the numbers have fallen off Becky's number line. Can you figure out what they were?
You'll need to know your number properties to win a game of Statement Snap...
Are these statements always true, sometimes true or never true?
Are these statements always true, sometimes true or never true?
Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?
Are these statements relating to odd and even numbers always true, sometimes true or never true?
Try out some calculations. Are you surprised by the results?
This task combines spatial awareness with addition and multiplication.
This challenge combines addition, multiplication, perseverance and even proof.
How could you estimate the number of pencils/pens in these pictures?
In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.
How many possible symmetrical necklaces can you find? How do you know you've found them all?
Take three consecutive numbers and add them together. What do you notice?
This ladybird is taking a walk round a triangle. Can you see how much he has turned when he gets back to where he started?
Look at what happens when you take a number, square it and subtract your answer. What kind of number do you get? Can you prove it?
What happens when you add three numbers together? Will your answer be odd or even? How do you know?
This problem looks at how one example of your choice can show something about the general structure of multiplication.
This investigates one particular property of number by looking closely at an example of adding two odd numbers together.
Here's a very elementary code that requires young children to read a table, and look for similarities and differences.
How will you decide which way of flipping over and/or turning the grid will give you the highest total?
How would you create the largest possible two-digit even number from the digit I've given you and one of your choice?
What is the smallest number of answers you need to reveal in order to work out the missing headers?
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?
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 activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Investigate the sum of the numbers on the top and bottom faces of a line of three dice. What do you notice?
Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.
You have a set of the digits from 0 to 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?
Try grouping the dominoes in the ways described. Are there any left over each time? Can you explain why?
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?
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?
Here are some rods that are different colours. How could I make a yellow rod using white and red rods?
As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?
Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?
Four bags contain a large number of 1s, 3s, 5s and 7s. Can you pick any ten numbers from the bags so that their total is 37?
I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.
Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?
Noah saw 12 legs walk by into the Ark. How many creatures did he see?