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

9 December

Write the numbers 1 to 15 in a row. Underneath, write the same list without the first and last numbers. Continue this until you have just one number left.
Today's number is the sum of all the numbers you have written.
Tags: numbers


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


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


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