There is a great amount of satisfaction that can be obtained from solving a mathematical puzzle. There are many puzzles on this page, all with a mathematical connection, that are just waiting to be solved. You can earn Transum Trophies for the puzzles you solve.
Fill in the squares according to the clues given by the string of numbers for each row and column.
Some picture grid puzzles which can be solved by using simultaneous equations.
A simplified, mathematical version of the challenge seen in the British TV programme Only Connect. Find the connections between the terms.
Calculate the missing numbers in these partly completed pyramid puzzles.
Numbers in the bricks are found by adding the two bricks immediately below together. Can you achieve the given target?
The chessboard has been broken into 13 pieces. Can you put it back together?
A puzzle to find four different ways of making 900 by multiplying together three different numbers.
Arrange the given numbers as bases and indices in the three-term sum to make the target total.
This is quite a challenging number grouping puzzle requiring a knowledge of prime, square and triangular numbers.
The Transum version of the traditional sliding tile puzzle.
Find where the mines are hidden without stepping on one.
Arrange the twelve pentominoes in the outline of a rectangle.
Online, interactive jigsaw puzzles of grids of numbers.
An online interactive jigsaw puzzle of a grid of Roman numerals.
Interactive jigsaw puzzles of four by four magic squares.
A number arranging puzzle with seven levels of challenge.
Use your knowledge of rectangle areas to calculate the missing measurement of these composite diagrams.
Can you get your car out of the very crowded car park by moving other cars forwards or backwards?
Find expressions using only one digit which equal the given targets.
Arrange the numbers from 1 to 9 to make an expression with a value of 100.
Arrange the sixteen numbers on the four by four grid so that groups of four numbers in a pattern add up to the same total.
Arrange the sixteen numbers on the octagram so that the numbers in each line add up to the same total.
Arrange the twelve numbers on the hexagram so that the numbers in each line add up to the same total.
Arrange the twelve numbers in the triangles on the hexagram so that the numbers in each line of five triangles add up to the same total.
Arrange the given digits to make six 3-digit numbers that combine in an awesome way.
Arrange the numbered footballs on the goal posts to make three, 3-number products that are all the same.
Quite a challenging number placing puzzle involving fractions.
Each row, column and diagonal should produce the same sum.
Like the magic square but all of the totals should be different.
Solve the problem of getting four people through a tunnel with one torch in the minimum amount of time.
Can you find a 6 digit number containing two each of the digits one to three which obeys the rules given?
Can you draw these diagrams without lifting your pencil from the paper? This is an interactive version of the traditional puzzle.
The traditional River Crossing challenge. Can you do it in the smallest number of moves?
Arrange the numbers from 1 to 6 in the spaces to make the division calculation correct.
Arrange a rota for the Scouts to travel in boats so that they are with different people each day.
Calculate the areas of all the possible quadrilaterals that can be constructed by joining together dots on this grid.
Arrange the given number tiles to make two 2 digit numbers that add up to the given total.
A great puzzle requiring you to use all of the cards to create a continuous red line from start to finish.
Change the numbers on the apples so that the number on the lemon is the given total.
Make a schedule for the 24-hour Darts Marathon which will take into account everyone's requests and keep everyone happy.
Let the psychic read the cards and magically reveal the number you have secretly chosen. What is the mathematics that makes this trick work?
Interactive, randomly-generated, number-based logic puzzle designed to develop numeracy skills.
Arrange the numbers from 1 to 14 in the spaces to make the sums correct. How fast can you do it?
Interactive number-based logic puzzles similar to those featuring in daily newspapers.
Arrange the given digits to make a Latin square with the given row and column calculation results.
Arrange the nine pieces of the puzzle on the grid to make different polygons.
A fewest-moves, counter-swapping challenge invented in northern Thailand.
A logic challenge requiring a strategy to update each of the numbers in a grid.
Drag the numbers into the red cells so that the sum of the three numbers in each row and each column is a prime number.
Arrange the cards to create a valid mathematical statement.
Toss the pancakes until they are neatly stacked in order of size. Find how to do this using the smallest number of moves.
Find the mathematical words in the grid of letters.
Help the cops catch the robbers by finding the vectors that will end the chase.
Solve the number puzzles drawn on the pavement of Trafalgar Square in London.
Arrange the digits 1 to 9 on the triangle so that the sum of the numbers along each side is equal to the given total.
Arrange the given digits to make three numbers such that the third is the product of the first and the second.
Arrange the digits to make three 3 digit numbers such that the second is double the first and the third is three times the first.
The students numbered 1 to 8 should sit on the chairs so that no two consecutively numbered students sit next to each other.
In how many different ways can the numbers be arranged to give the same totals?
Drag the 20 flowers into the gardens so that 9 flowers are visible from each window of the house.
Join up the stars to find the hidden regular polygons.
Place the nine numbers in the table so they obey the row and column headings about the properties of the numbers.
Use the pieces of the T puzzle to fit into the outlines provided. A drag, rotate and drop interactive challenge.
Move the trams to their indicated parking places in the shunting yard as quickly as possible.
Find all of the possible ways of making the magic total from the numbers in this four by four magic square.
Find all the ways of painting the faces of cubes using only two colours.
Arrange the given digits to make three numbers such that two of them add up to the third.
Use the pieces of the tangram puzzle to make the basic shapes then complete the table showing which shapes are possible.
Turn your calculator upside down to make words out of the answers to these questions.
Vowels have been taken out of mathematical words. Can you recognise them?
If you were to pick up the sticks from this pile so that you were always removing the top stick what calculation would you create?
Arrange the digits one to nine on the spaces provided to make two division calculations containing multiples of three.
Arrange the digits one to nine to make the four calculations correct.
Place the digits one to nine in each of the regions created by the Olympic rings so that the sum of the numbers in each ring is the same.
Find the missing numbers in these triangular, self-checking puzzles and discover the wonders of these fascinating structures.
Divide the grid into rectangular pieces so that the area of each piece is the same as the number it contains.
A hands on activity requiring students to arrange Christmas ornaments in a square box.
Find the five numbers which when added or multiplied together in pairs to produce the given sums or products.
Find the path to the centre of the labyrinth by moving along the prime numbers.
Can you arrange the seven counters on the grid despite their truculent behaviour?
An interactive mathematical crossword for you to do online. Find the missing words from the given clues.
A game, a puzzle and a challenge involving counters being placed at the corners of a square on a grid.
Arrange the scallywags and scoundrels on the chairs so that the numbers of any two sitting next to each other add up to a prime number.
Find which numbers in a given list do not combine with other numbers on the list to make a given sum.
Can you arrange all of the counters on the grid to form 10 lines of three counters?
Arrange the dominoes in seven squares. The number of dots along each side of the square must be equal to the number in the middle
Click on six fleur-de-lis to leave an even number in each row and column.
This is an interactive version of the puzzle described by Henry Ernest Dudeney in The Canterbury Puzzles
Arrange the digits one to nine to make a number which is divisible in the way described.
Use the digits 1 to 9 to make three 3 digit numbers which add up to 999.
Arrange the numbers on the squares so that the totals along each line of three squares are equal.
An interactive activity challenging you to reproduce a pattern of coloured squares according to given clues.
A puzzle requiring the arrangement of numbers on the function machines to link the given input numbers to the correct output.
Interactive, randomly-generated, number-based logic puzzle designed to develop numeracy skills.
An online, interactive version of the popular number placing puzzle.
A jumbled moving-block puzzle cube is shown as a net. Can you solve it?
Find the hidden wallaby using the clues revealed at the chosen coordinates.
Can you make 4 litres if you only have 7 and 5 litre jugs?
Crack the code by replacing the encrypted letters in the given text. There are lots of hints provided about code breaking techniques.
How many different sets of four dots can be joined to form a square?
Move the pieces of the tower from one place to another in the minimum number of moves.
Arrange the given numbers on the cross so that the sum of the numbers in both diagonals is the same.
A drag and drop activity challenging you to arrange the digits to produce the largest possible product.
A different way to complete a Sudoku puzzle with clues available at every stage.
Arrange numbers on the plane shaped grid to produce the given totals
There are plenty more puzzles on the Transum website.
A Half Mean Angle
Find the size of the angle at A if it is half of the mean of the angles at B and C.
Chris and his Unpredictable Kids
A think of a number puzzle with an unpredictable element.
Two-Faced and Blue
How many of the smaller cubes that make up the 3x3 cube have two faces painted blue?
Santa is Cool
What temperature is reported using the same number in Celsius and Fahrenheit?
Three Trios of Triplets Thrice
A simple question that seventy two percent of a group of people got wrong.
Six Ropes
Can the pirates win their freedom by tying the six pieces of rope into one large loop?
Bogdan and Wally
In what order should you play Ultimate Noughts and Crosses against Wally and Bogdan?
Eva's Eggs and Fickle Fractions
How many eggs did Eva take to market in order to make those strange half sales?
Feeding Fools and Horses
How long will the horse feed last the horses after some of them left the stables?
Balancing Balloons
How many balloons must Jamie give to Ben to balance the balloon equation?
A Puzzle from Carl
Carl's puzzle is about the result of dividing the product of his parents' ages by double his own age.
Odds from evens up to 2020
Subract the sum of the odd numbers less than 2020 from the sum of the even numbers less than 2020.
Noel in Lapland
Work out the length of Noel's trip to Lapland given the details of the weather conditions.
Multiple Remainders
What is the second smallest number such that when it is divided by 5 the remainder is 4, and when divided by 7 the remainder is 6?
Coaches to Cambridge
Can you figure out which coach I travelled in when I went to Cambridge?
Percy Cod's Kids
Percy Cod was talking about his children. Can you work out their ages given the ratios?
Carrot-eating Critters
Work out how many of each kind of animal are in the field from their carrot-eating habits.
Patsy Loves Percy
The strange case of Percy who seems to be getting older very quickly
Monkeys, Kittens and Dogs
Who is most likely to be able to work out the square root of 121?
Feed The Horses
How long will the remaining feed last the horses that have not been sold?
Strange Addition
If I start at five and add six I get eleven but if I start at six and add seven I get one.
Prime Permutations
Of all the permutations of 1 to 9 used to make nine-digit numbers, how many are prime?
4-Digit Hotel Room Safe Code
Can you work out what number I used to lock and unlock my hotel room safe?
Choir Eye Colour
Figure out the percentage of choir members that do not have blue eyes from the clues given.
Calculator Keys at the Corners of a Rectangle
A question about the four keys at the corners of a rectangle on a calculator.
Average House Numbers
Work out the house numbers from the clues about the mean, median and mode.
Five integers with a product of 12
Can you find five integers that multiply together to give twelve?
Square in a Rectangle
What is the largest square that can be drawn in the corner of a 10cm by 15cm rectangle?
London Marathon
A question about the average speed required for the second half of the marathon.
Cutting the Lawn
Aynuk and Ayli cut half of the lawn each. How long is each side of the square lawn?
Forty Five in Four Parts
Split the number 45 into four parts according to the given information.
Shrivelled Spuds
Work out the weight of the potatoes after they have been left out in the sun to dry.
Transposition Error
Work out the bank balance given information about the transposition error.
Counting Sheep
Work out the number of sheep owned by Percy and Patsy from the given clues.
Juggling with Egg Timers
Can you time exactly nine minutes using the four and seven minute egg timers?
Permutation Sum
What is sum of all the four digit numbers containing all of the digits one to four?
Odd Probability
What is the probability that two random numbers are both even if they are not both odd?
Regions in Circles
Calculate the number of regions in a circle formed by intersecting chords.
Brothers and Sisters
Can you work out the number of children in the Numlove family given the clues about brothers and sisters?
Exam Average
What mark is required in the last exam to achieve an 80% overall average?
Holy Sphere
Calculate the remaining volume of the sphere after a cylindrical hole has been drilled through the centre
Jumping Flea
How many different places could the flea find itself after 8 foot-long jumps either north, south, east or west?
Last Digit
How many positive two-digit numbers are there whose square and cube both end in the same digit?
Central Station
The probability that the next train to leave will be going north is five times the probability that the next train to leave will be going south.
Separated Twins
Work out the combination of the safe given the clues about pairs of numbers.
Divisible By Three
A puzzle about two digit numbers that can be made from ten different digits.
Letters In Numbers
A brand new puzzle involving the letters in numbers when written as words.
Square Angled Triangle
The angles of a triangle are all square numbers. What are they?
Tri-Junction Puzzle
What is the probability of the three cars arriving at the road junction not being involved in an accident?
Two Prime Squares
What is the smallest square number (greater than one) that cannot be expressed as the sum of two prime numbers?
The Missing Pound
Where did the missing pound go in this story about three people visiting a restaurant?
Ticks, Tocks, Tacks and Tucks
Find how ticks compare to tocks, tacks and tucks from the given information.
The Power of Christmas
A question about indices to get you thinking mathematically at this festive time of year.
Ant and Dec
What single question could Dec ask Ant to find out what he is thinking?
Three Mathematicians
How can the third mathematician be so certain that everyone wants a drink?
Unfinished Game
If the coin tossing game was cut short how would you share the winnings?
Best Dice
Which of the unusual dice would you choose to give you the best chance of winning the prize?
The Birthday Problem
What is the probability of two or more pupils in a class having the same birthday?
Twelve Days of Christmas
Can you figure out exactly how many gifts the true love sends during the twelve days of the Christmas holiday?
Chased by a Bear
A puzzle about an explorer being chased by a bear along with a question about imperial and metric measures with Measurement Man
Halloween Bases
A puzzle about Why is halloween like Christmas along with news of the new Number Skills Inventory
Torch Tunnel
A puzzle about four people making their way through a tunnel with just one torch along with news of the new numerology page
Cube in Milk
A puzzle about a cube being lowered into a bucket of milk along with news of the new shunting puzzles
Angle Thinking
Find the range of possible angles, x, for which tan x > cos x > sin x
Average Cycling Speed
Work out the average speed of two journeys. The obvious answer is not the correct answer.
Bertrand's Box Paradox
Bertrand's box paradox is a paradox of elementary probability theory, first posed by Joseph Bertrand in 1889
Best Dice
Which of the unusual dice would you choose to give you the best chance of winning the prize?
Charging Rhinos
Find the easy way to solve this kinematics problem involving a fly and two rhinos.
Cheryl's Birthday
Use a process of elimination to work out the correct date from the clues given.
Divisible by 11
Can you prove that a three digit number whose first and third digits add up to the value of the second digit must be divisible by eleven?
Double or Half?
At ten percent change per day is doubling achieved faster than halving?
Fence Optimisation
Find the length of a rectangle enclosing the largest possible area.
Find The Radius
Find the radius of the circle from the small amount of information provided.
Four Fraction Division
Explain why the answer to a series of fraction divisions is a whole number.
Geometry Snack
Find the value of the marked angle in this diagram from the book Geometry Snacks
Grandmother
How far would grandma have travelled after a suitably large number of days given her walking regime?
Hands Together
The hands of a clock are together at midnight. At what time are they next together?
HCF and LCM given
If given the HCF, LCM and the smaller of two numbers can you find the other?
How Many Left Handers?
Work out the number of members if the probability of left-handed members being randomly selected is given.
Hundred and Fifty Percent
Divide 110 into two parts so that the larger part is 150% of the smaller part.
Key Eleven
Prove that a four digit number constructed in a certain way will be a multiple of eleven.
Log Perfection
Determine whether the given statements containing logarithms are true or false
Maximum Product
Two numbers add up to 10. What's the largest possible product they could have?
Nine Digit Numbers
How many different nine digit numbers are their that contain each of the digits from one to nine?
Paper Ratio
Calculate the ratio of the sides of an A4 sheet of paper without any measuring.
Paper Surprising Perimeter
Find the perimeter of a folded sheet of A4 paper as described in this short video.
Parallel Graphs
Determine from their equations which of the straight line graphs are parallel and perpendicular.
Penny Bags
Can you place 63 pennies in bags in such a way that you can give away any amount of money (from 1p to 63p) by giving a selection of these prepacked bags?
Permutable Functions
Find pairs of functions that are commutative under composition.
Piece of String
Find where a piece of string should be cut to form a circle and a square of equal areas.
Pizza Slice
A problem which can be solved by considereing the areas of a triangle and a sector of a circle.
Product of Indices
Find the product of the unknown indices that feature in two equations
Quad Midpoints
What shape is created when the midpoints of the sides of a quadrilateral are joined together?
Restrained Flea
How many different places could the flea find itself after 8 foot-long jumps either north, south, east or west?
Reverse Connection
Find a general rule for the difference between a two digit number and that same number with the digits reversed.
Rice on a Chess Board
How many grains of rice are on a chess board if each square has twice the number of grains as the previous square.
Road Connections
Design roads to connect four houses that are on the corners of a square, side of length one mile, to minimise the total length of the roads.
Same Series Sum
Find an arithmetic series and a geometric series that have the same sum of the first five terms.
Same Three Digits
Find ex
Seventeen Camels
Explain the mathematics of the classic ninteenth century fraction sharing story.
Single Fraction
Simplify an expression involving fractions, exponents and a quare root.
Sphere Hole
Find the volume of the remaining part of a sphere after a 10cm cylindrical hole has been drilled through it.
Square in Rectangle
Find the area of a square drawn under the diagonal of a rectangle
Test Scores
Explore the misconception that when adding fractions you add both the numerators and the denominators
Three Right Triangles
Calculate the lengths of the unlabelled sides of these right-angled triangles.
Transum Tonic
What is the largest number of bottles that it is not possible to buy if they come in packs of 6, 9, and 20?
Tri-Junction
A real life situation that can be analysed with the use of a tree diagram.
Two real numbers
The sum of the reciprocals of two real numbers is -1, and the sum of their cubes is 4. What are they?
Unfinished Game
Share the prize in a fair ratio according to the probability of each player willing.
Unlucky Seven Eleven
Follow the instructions to multiply a chosen number then explain the result you get.
Vowel Code
How many ways can you create a code for the vowels by assigning to each vowel a different vowel?
What Question?
Write down all the possible questions that could have been asked if this was the diagram provided in a mathematics textbook.
Eric Levy, United States
Thursday, November 17, 2016
"Thank you for the podcasts! I really enjoy the puzzles. This relates to the 5/29/15 podcast re: coin flipping game that was stopped before completion. The flips when stopped were two Heads and one Tail. You indicate that the options on next 2 tosses are HH, TH, HT, and TT. Since the game stops when one person reaches 3 points, wouldn't HH and HT be the same, as the second flip isn't needed? This seems to match your ultimate answer of 75% and 25%, though ... with the person with Tails only winning with TT, which is 25% chance. I get the same answer but intermediate steps differ. Am I looking at this incorrectly? Thanks!."
Transum,
Thursday, November 17, 2016
"Dear Eric, Thanks so much for your observations and you are completely right. The only reason I chose to list the next two outcomes was to produce equally likely outcomes making the arithmetic very slightly easier. I am glad you enjoy the puzzles."
Dubai English Speaking School, Twitter
Wednesday, January 24, 2018
Elena Bezoari, Twitter
Saturday, June 8, 2019
Ann, London
Tuesday, September 3, 2019
"Hi there!
Great maths puzzles & activities. Thank you.
Do you have the answers?
[Transum: Hello Ann, Thanks for leaving a comment on the Transum Puzzles page. Yes, each of the puzzles has an answer that appears when you are logged in as a subscriber. You can find a subscription application form here. "