If you have only four weights, where could you place them in order to balance this equaliser?
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?
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
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?
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.
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
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?
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?
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?
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?
How many trains can you make which are the same length as Matt's and Katie's, using rods that are identical?
How many different rectangles can you make using this set of rods?
Can you work out how to balance this equaliser? You can put more than one weight on a hook.
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?
Have a go at balancing this equation. Can you find different ways of doing it?
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?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Can you find the chosen number from the grid using the clues?
The discs for this game are kept in a flat square box with a square hole for each. Use the information to find out how many discs of each colour there are in the box.
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.
An investigation that gives you the opportunity to make and justify predictions.
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?
How will you work out which numbers have been used to create this multiplication square?
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?
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?
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.
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?
This activity focuses on doubling multiples of five.
Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
Can you complete this jigsaw of the multiplication square?
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?
Can you work out some different ways to balance this equation?
Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?
Use this grid to shade the numbers in the way described. Which numbers do you have left? Do you know what they are called?
Can you make square numbers by adding two prime numbers together?
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?
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?
Are these domino games fair? Can you explain why or why not?
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?
Number problems at primary level that may require resilience.
Follow the clues to find the mystery number.
When Charlie asked his grandmother how old she is, he didn't get a straightforward reply! Can you work out how old she is?
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?
Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?
Can you find different ways of creating paths using these paving slabs?
Number problems at primary level to work on with others.
Use the interactivities to complete these Venn diagrams.
"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 ...?