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?
On a farm there were some hens and sheep. Altogether there were 8 heads and 22 feet. How many hens were there?
Number problems at primary level that may require resilience.
This activity focuses on doubling multiples of five.
Use this grid to shade the numbers in the way described. Which numbers do you have left? Do you know what they are called?
Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?
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?
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?
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?
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?
How will you work out which numbers have been used to create this multiplication square?
When Charlie asked his grandmother how old she is, he didn't get a straightforward reply! Can you work out how old she is?
The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?
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?
Find the squares that Froggie skips onto to get to the pumpkin patch. She starts on 3 and finishes on 30, but she lands only on a square that has a number 3 more than the square she skips from.
Your vessel, the Starship Diophantus, has become damaged in deep space. Can you use your knowledge of times tables and some lightning reflexes to survive?
Are these domino games fair? Can you explain why or why not?
Does this 'trick' for calculating multiples of 11 always work? Why or why not?
What is the lowest number which always leaves a remainder of 1 when divided by each of the numbers from 2 to 10?
Nine squares with side lengths 1, 4, 7, 8, 9, 10, 14, 15, and 18 cm can be fitted together to form a rectangle. What are the dimensions of the rectangle?
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?
Ben’s class were cutting up number tracks. First they cut them into twos and added up the numbers on each piece. What patterns could they see?
Can you find different ways of creating paths using these paving slabs?
Number problems at primary level to work on with others.
Can you place the numbers from 1 to 10 in the grid?
Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.
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?
Is it possible to draw a 5-pointed star without taking your pencil off the paper? Is it possible to draw a 6-pointed star in the same way without taking your pen off?
56 406 is the product of two consecutive numbers. What are these two numbers?
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?
Can you make square numbers by adding two prime numbers together?
Can you work out what a ziffle is on the planet Zargon?
One quarter of these coins are heads but when I turn over two coins, one third are heads. How many coins are there?
Can you work out some different ways to balance this equation?
Nearly all of us have made table patterns on hundred squares, that is 10 by 10 grids. This problem looks at the patterns on differently sized square grids.
Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?
Factor track is not a race but a game of skill. The idea is to go round the track in as few moves as possible, keeping to the rules.
Help share out the biscuits the children have made.
Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?
A game for 2 people using a pack of cards Turn over 2 cards and try to make an odd number or a multiple of 3.
Investigate the sum of the numbers on the top and bottom faces of a line of three dice. What do you notice?
An investigation that gives you the opportunity to make and justify predictions.
"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 ...?
How can you use just one weighing to find out which box contains the lighter ten coins out of the ten boxes?
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?
This article for teachers describes how number arrays can be a useful reprentation for many number concepts.
Have a go at balancing this equation. Can you find different ways of doing it?
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?
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?
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?