There is a clock-face where the numbers have become all mixed up. Can you find out where all the numbers have got to from these ten statements?
Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?
Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only.
How many different shaped boxes can you design for 36 sweets in one layer? Can you arrange the sweets so that no sweets of the same colour are next to each other in any direction?
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
Suppose we allow ourselves to use three numbers less than 10 and multiply them together. How many different products can you find? How do you know you've got them all?
The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
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?
Can you find the chosen number from the grid using the clues?
How many trains can you make which are the same length as Matt's, using rods that are identical?
Can you make square numbers by adding two prime numbers together?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Have a go at balancing this equation. Can you find different ways of doing it?
Can you work out how to balance this equaliser? You can put more than one weight on a hook.
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?
In this maze of hexagons, you start in the centre at 0. The next hexagon must be a multiple of 2 and the next a multiple of 5. What are the possible paths you could take?
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?
Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?
Can you work out some different ways to balance this equation?
You can make a calculator count for you by any number you choose. You can count by ones to reach 24. You can count by twos to reach 24. What else can you count by to reach 24?
Number problems at primary level that may require resilience.
In this problem we are looking at sets of parallel sticks that cross each other. What is the least number of crossings you can make? And the greatest?
I throw three dice and get 5, 3 and 2. Add the scores on the three dice. What do you get? Now multiply the scores. What do you notice?
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
If there is a ring of six chairs and thirty children must either sit on a chair or stand behind one, how many children will be behind each chair?
Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?
Can you place the numbers from 1 to 10 in the grid?
Are these domino games fair? Can you explain why or why not?
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!
Number problems at primary level to work on with others.
The discs for this game are kept in a flat square box with a square hole for each disc. Use the information to find out how many discs of each colour there are in the box.
An investigation that gives you the opportunity to make and justify predictions.
This activity focuses on doubling multiples of five.
What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.
There are ten children in Becky's group. Can you find a set of numbers for each of them? Are there any other sets?
Complete the magic square using the numbers 1 to 25 once each. Each row, column and diagonal adds up to 65.
Use this grid to shade the numbers in the way described. Which numbers do you have left? Do you know what they are called?
Got It game for an adult and child. How can you play so that you know you will always win?
Follow the clues to find the mystery number.
Look at the squares in this problem. What does the next square look like? I draw a square with 81 little squares inside it. How long and how wide is my square?
"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 ...?
On a farm there were some hens and sheep. Altogether there were 8 heads and 22 feet. How many hens were there?
How many different sets of numbers with at least four members can you find in the numbers in this box?
On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?
48 is called an abundant number because it is less than the sum of its factors (without itself). Can you find some more abundant numbers?
If you have only four weights, where could you place them in order to balance this equaliser?
When Charlie asked his grandmother how old she is, he didn't get a straightforward reply! Can you work out how old she is?
This article for teachers describes how number arrays can be a useful reprentation for many number concepts.
A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.