Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?
Can you work out how to balance this equaliser? You can put more than one weight on a hook.
Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
You have 4 red and 5 blue counters. How many ways can they be placed on a 3 by 3 grid so that all the rows columns and diagonals have an even number of red counters?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Place the numbers 1 to 8 in the circles so that no consecutive numbers are joined by a line.
Place the 16 different combinations of cup/saucer in this 4 by 4 arrangement so that no row or column contains more than one cup or saucer of the same colour.
There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?
This challenge involves calculating the number of candles needed on birthday cakes. It is an opportunity to explore numbers and discover new things.
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?
A game for 2 people. Take turns placing a counter on the star. You win when you have completed a line of 3 in your colour.
Follow the clues to find the mystery number.
Exactly 195 digits have been used to number the pages in a book. How many pages does the book have?
Use the clues to colour each square.
Move from the START to the FINISH by moving across or down to the next square. Can you find a route to make these totals?
Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?
In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?
Can you find the chosen number from the grid using the clues?
What happens when you try and fit the triomino pieces into these two grids?
Can you cover the camel with these pieces?
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
How many ways can you find to do up all four buttons on my coat? How about if I had five buttons? Six ...?
This cube has ink on each face which leaves marks on paper as it is rolled. Can you work out what is on each face and the route it has taken?
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?
Only one side of a two-slice toaster is working. What is the quickest way to toast both sides of three slices of bread?
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?
This task encourages you to investigate the number of edging pieces and panes in different sized windows.
A challenging activity focusing on finding all possible ways of stacking rods.
Number problems at primary level that require careful consideration.
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
How many trains can you make which are the same length as Matt's, using rods that are identical?
Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?
What happens when you add three numbers together? Will your answer be odd or even? How do you know?
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
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?
There is a long tradition of creating mazes throughout history and across the world. This article gives details of mazes you can visit and those that you can tackle on paper.
Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.
Make your own double-sided magic square. But can you complete both sides once you've made the pieces?
There are lots of different methods to find out what the shapes are worth - how many can you find?
My dice has inky marks on each face. Can you find the route it has taken? What does each face look like?
Using different numbers of sticks, how many different triangles are you able to make? Can you make any rules about the numbers of sticks that make the most triangles?
There are 44 people coming to a dinner party. There are 15 square tables that seat 4 people. Find a way to seat the 44 people using all 15 tables, with no empty places.
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?
Alice and Brian are snails who live on a wall and can only travel along the cracks. Alice wants to go to see Brian. How far is the shortest route along the cracks? Is there more than one way to go?
Make a pair of cubes that can be moved to show all the days of the month from the 1st to the 31st.
The ancient Egyptians were said to make right-angled triangles using a rope with twelve equal sections divided by knots. What other triangles could you make if you had a rope like this?
Take 5 cubes of one colour and 2 of another colour. How many different ways can you join them if the 5 must touch the table and the 2 must not touch the table?