A Sudoku with clues as ratios or fractions.
A monkey with peaches, keeps a fraction of them each day, gives the rest away, and then eats one. How long can his peaches last?
There are seven pots of plants in a greenhouse. They have lost their labels. Perhaps you can help re-label them.
A cinema has 100 seats. Show how it is possible to sell exactly 100 tickets and take exactly £100 if the prices are £10 for adults, 50p for pensioners and 10p for children.
A Sudoku with clues as ratios.
Can you rearrange the biscuits on the plates so that the three biscuits on each plate are all different and there is no plate with two biscuits the same as two biscuits on another plate?
Different combinations of the weights available allow you to make different totals. Which totals can you make?
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
How many ways can you find to do up all four buttons on my coat? How about if I had five buttons? Six ...?
Mr McGregor has a magic potting shed. Overnight, the number of plants in it doubles. He'd like to put the same number of plants in each of three gardens, planting one garden each day. Can he do it?
A Sudoku with clues given as sums of entries.
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.
The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?
Given the products of diagonally opposite cells - can you complete this Sudoku?
This Sudoku requires you to do some working backwards before working forwards.
Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?
Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?
A Sudoku with clues as ratios.
Only one side of a two-slice toaster is working. What is the quickest way to toast both sides of three slices of bread?
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
Can you find six numbers to go in the Daisy from which you can make all the numbers from 1 to a number bigger than 25?
Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?
The number of plants in Mr McGregor's magic potting shed increases overnight. He'd like to put the same number of plants in each of his gardens, planting one garden each day. How can he do it?
Make your own double-sided magic square. But can you complete both sides once you've made the pieces?
Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.
How many different rectangles can you make using this set of rods?
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.
This challenge, written for the Young Mathematicians' Award, invites you to explore 'centred squares'.
The items in the shopping basket add and multiply to give the same amount. What could their prices be?
A merchant brings four bars of gold to a jeweller. How can the jeweller use the scales just twice to identify the lighter, fake bar?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Using all ten cards from 0 to 9, rearrange them to make five prime numbers. Can you find any other ways of doing it?
Lolla bought a balloon at the circus. She gave the clown six coins to pay for it. What could Lolla have paid for the balloon?
What could the half time scores have been in these Olympic hockey matches?
A Sudoku that uses transformations as supporting clues.
Tom and Ben visited Numberland. Use the maps to work out the number of points each of their routes scores.
This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.
Make a pair of cubes that can be moved to show all the days of the month from the 1st to the 31st.
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?
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?
What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?
Tim's class collected data about all their pets. Can you put the animal names under each column in the block graph using the information?
How will you go about finding all the jigsaw pieces that have one peg and one hole?
There are 4 jugs which hold 9 litres, 7 litres, 4 litres and 2 litres. Find a way to pour 9 litres of drink from one jug to another until you are left with exactly 3 litres in three of the jugs.
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?
These activities focus on finding all possible solutions so working in a systematic way will ensure none are left out.
The clues for this Sudoku are the product of the numbers in adjacent squares.
If we had 16 light bars which digital numbers could we make? How will you know you've found them all?
On a digital clock showing 24 hour time, over a whole day, how many times does a 5 appear? Is it the same number for a 12 hour clock over a whole day?
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?