problem
Super Shapes
Age
7 to 11
Challenge level
The value of the circle changes in each of the following problems. Can you discover its value in each problem?
problem
Squares in a Square
Age
11 to 14
Challenge level
In the diagram, the small squares are all the same size. What fraction of the large square is shaded?
problem
Potatoes
Age
11 to 14
Challenge level
Weekly Problem 19 - 2009
When I looked at the greengrocer's window I saw a sign. When I went in and looked from the other side, what did I see?
problem
Soma Surface
Age
11 to 14
Challenge level
What is the surface area of the solid shown?
problem
Island Hopping
Age
11 to 14
Challenge level
What is the smallest number of ferry trips that Neda needs to take to visit all four islands and return to the mainland?
problem
Printing Error
Age
11 to 14
Challenge level
Every third page number in this book has been omitted. Can you work out what number will be on the last page?
problem
Starting Fibonacci
Age
11 to 14
Challenge level
What is the first term of a Fibonacci sequence whose second term is 4 and fifth term is 22?
problem
Folded A4
Age
11 to 14
Challenge level
What shapes can be made by folding an A4 sheet of paper only once?
problem
Painted Octahedron
Age
11 to 14
Challenge level
What is the smallest number of colours needed to paint the faces of a regular octahedron so that no adjacent faces are the same colour?
problem
Bishop's Paradise
Age
11 to 14
Challenge level
Weekly Problem 37 - 2013
Which of the statements about diagonals of polygons is false?
problem
Daniel's Star
Age
11 to 14
Challenge level
A solid 'star' shape is created. How many faces does it have?
problem
Night Watchmen
Age
11 to 14
Challenge level
Grannie's watch gains 30 minutes every hour, whilst Grandpa's watch loses 30 minutes every hour. What is the correct time when their watches next agree?
problem
Same Face
Age
11 to 14
Challenge level
A cube is rolled on a plane, landing on the squares in the order shown. Which two positions had the same face of the cube touching the surface?
problem
Semaphore
Age
11 to 14
Challenge level
I am standing behind five pupils who are signalling a five-digit number to someone on the opposite side of the playground. What number is actually being signalled?
problem
Don't Be Late
Age
11 to 14
Challenge level
Mary is driving to Birmingham Airport. Using her average speed for the entire journey, find how long her journey took.
problem
Adjacent Factors
Age
11 to 14
Challenge level
Two numbers can be placed adjacent if one of them divides the other. Using only $1,...,10$, can you write the longest such list?
problem
Reading from Behind
Age
11 to 14
Challenge level
Can you find the time between 3 o'clock and 10 o'clock when my digital clock looks the same from both the front and back?
problem
Integral Polygons
Age
11 to 14
Challenge level
Each interior angle of a particular polygon is an obtuse angle which is a whole number of degrees. What is the greatest number of sides the polygon could have?
problem
Fifty Coins
Age
11 to 14
Challenge level
Cheryl finds a bag of coins. Can you work out how many more 5p coins than 2p coins are in the bag?
problem
Turning N Over
Age
11 to 14
Challenge level
A card with the letter N on it is rotated through two different axes. What does the card look like at the end?
problem
Product and Sum
Age
11 to 14
Challenge level
When Jim rolled some dice, the scores had the same product and sum. How many dice did Jim roll?
problem
Reflected Back
Age
11 to 14
Challenge level
Imagine reflecting the letter P in all three sides of a triangle in turn. What is the final result?
problem
Blockupied
Age
11 to 14
Challenge level
A 1x2x3 block is placed on an 8x8 board and rolled several times.... How many squares has it occupied altogether?
problem
Hamiltonian Cube
Age
11 to 16
Challenge level
Weekly Problem 36 - 2007
Find the length along the shortest path passing through certain points on the cube.
problem
Doubly Symmetric
Age
11 to 14
Challenge level
What is the smallest number of additional squares that must be shaded so that this figure has at least one line of symmetry and rotational symmetry of order 2?
problem
Doubly Consecutive Sums
Age
11 to 14
Challenge level
How many numbers less than 2017 are both the sum of two consecutive integers and the sum of five consecutive integers?
problem
17s and 23s
Age
11 to 14
Challenge level
Can you form this 2010-digit number...
problem
Crawl Around the Cube
Age
11 to 14
Challenge level
Weekly Problem 37 - 2010
An ant is crawling around the edges of a cube. From the description of his path, can you predict when he will return to his starting point?
problem
Kangaroo Hops
Age
11 to 14
Challenge level
Weekly Problem 11 - 2011
Kanga hops ten times in one of four directions. At how many different points can he end up?
problem
Hexagon Cut Out
Age
11 to 14
Challenge level
Weekly Problem 52 - 2012
An irregular hexagon can be made by cutting the corners off an equilateral triangle. How can an identical hexagon be made by cutting the corners off a different equilateral triangle?
problem
Revolutions
Age
11 to 14
Challenge level
Jack and Jill run at different speeds in opposite directions around the maypole. How many times do they pass in the first minute?
problem
Rectangle Rearrangement
Age
14 to 16
Challenge level
A 3x8 rectangle is cut into two pieces... then rearranged to form a right-angled triangle. What is the perimeter of the triangle formed?
problem
Twelve Cubed
Age
14 to 16
Challenge level
A wooden cube with edges of length 12cm is cut into cubes with edges of length 1cm. What is the total length of the all the edges of these centimetre cubes?
problem
Dicey Directions
Age
14 to 16
Challenge level
An ordinary die is placed on a horizontal table with the '1' face facing East... In which direction is the '1' face facing after this sequence of moves?
problem
Out of the Window
Age
14 to 16
Challenge level
Find out how many pieces of hardboard of differing sizes can fit through a rectangular window.
problem
Eulerian
Age
14 to 16
Challenge level
Weekly Problem 37 - 2014
Which of the five diagrams below could be drawn without taking the pen off the page and without drawing along a line already drawn?
problem
Semicircular Design
Age
14 to 16
Challenge level
Weekly Problem 9 - 2016
The diagram to the right shows a logo made from semi-circular arcs. What fraction of the logo is shaded?
problem
Oldest and Youngest
Age
14 to 16
Challenge level
Edith had 9 children at 15 month intervals. If the oldest is now six times as old as the youngest, how old is her youngest child?
problem
Travelator
Age
14 to 16
Challenge level
When Andrew arrives at the end of the walkway, how far is he ahead of Bill?
problem
Tennis Training
Age
14 to 16
Challenge level
After tennis training, Andy, Roger and Maria collect up the balls. Can you work out how many Andy collects?
problem
Painted Purple
Age
14 to 16
Challenge level
Three faces of a $3 \times 3$ cube are painted red, and the other three are painted blue. How many of the 27 smaller cubes have at least one red and at least one blue face?
problem
Facial Sums
Age
14 to 16
Challenge level
Can you make the numbers around each face of this solid add up to the same total?
problem
Folding in Half
Age
14 to 16
Challenge level
How does the perimeter change when we fold this isosceles triangle in half?
problem
Tied up
Age
14 to 16
Challenge level
How much of the field can the animals graze?
problem
Packing Boxes
Age
14 to 16
Challenge level
Look at the times that Harry, Christine and Betty take to pack boxes when working in pairs, to find how fast Christine can pack boxes by herself.
problem
Newspaper Sheets
Age
14 to 16
Challenge level
From only the page numbers on one sheet of newspaper, can you work out how many sheets there are altogether?
problem
Relative Time
Age
14 to 16
Challenge level
Albert Einstein is experimenting with two unusual clocks. At what time do they next agree?
problem
Bike Shop
Age
14 to 16
Challenge level
If I walk to the bike shop, but then cycle back, what is my average speed?
problem
Pyramidal n-gon
Age
14 to 16
Challenge level
The base of a pyramid has n edges. What is the difference between the number of edges the pyramid has and the number of faces the pyramid has?
problem
Cubic Covering
Age
14 to 16
Challenge level
A blue cube has blue cubes glued on all of its faces. Yellow cubes are then glued onto all the visible blue facces. How many yellow cubes are needed?
problem
Trisected Triangle
Age
14 to 16
Challenge level
Weekly Problem 34 - 2015
Four tiles are given. For which of them can three be placed together to form an equilateral triangle?
problem
Travelling by Train
Age
14 to 16
Challenge level
Stephen stops at Darlington on his way to Durham. At what time does he arrive at Durham?
problem
Centre Square
Age
14 to 16
Challenge level
What does Pythagoras' Theorem tell you about the radius of these circles?
problem
In or Out?
Age
14 to 16
Challenge level
Weekly Problem 52 - 2014
Four arcs are drawn in a circle to create a shaded area. What fraction of the area of the circle is shaded?
