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 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020