Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Advent calendar 2017

4 December

Pick a three digit number whose digits are all different.
Sort the digits into ascending and descending order to form two new numbers. Find the difference between these numbers.
Repeat this process until the number stops changing. The final result is today's number.


Show me a random puzzle
 Most recent collections 

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

List of all puzzles


unit fractions money partitions 2d shapes differentiation integration means clocks shape fractions christmas grids cards doubling planes chess regular shapes area wordplay geometry numbers colouring probability graphs functions hexagons volume multiplication floors books shapes calculus symmetry pascal's triangle spheres rugby digits percentages mean chalkdust crossnumber sum to infinity speed proportion addition lines remainders integers folding tube maps scales taxicab geometry triangles prime numbers games angles balancing averages cryptic clues dates factorials probabilty sums complex numbers rectangles sport ave logic odd numbers sequences indices factors algebra division crossnumbers 3d shapes coordinates surds perimeter perfect numbers arrows dice palindromes dodecagons polygons triangle numbers ellipses square numbers coins chocolate multiples number parabolas square roots routes cube numbers circles bases irreducible numbers quadratics menace star numbers time trigonometry squares crosswords cryptic crossnumbers people maths advent


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2019