# Advent calendar 2017

## Archive

Show me a random puzzle**Most recent collections**

#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

balancing 3d shapes odd numbers lines means integers time functions people maths symmetry prime numbers angles graphs coordinates grids routes area speed indices cards ave doubling parabolas perimeter crosswords colouring menace clocks cryptic crossnumbers sequences number perfect numbers probability polygons remainders fractions integration surds star numbers shape folding tube maps books christmas triangles differentiation cube numbers rugby trigonometry money mean dates multiples 2d shapes algebra irreducible numbers arrows pascal's triangle dodecagons ellipses chocolate regular shapes taxicab geometry dice averages factorials crossnumbers sums multiplication volume shapes squares palindromes bases geometry unit fractions calculus coins advent wordplay percentages division games quadratics floors square numbers cryptic clues spheres logic scales digits square roots partitions addition planes proportion numbers circles triangle numbers probabilty sum to infinity hexagons sport chalkdust crossnumber complex numbers factors chess rectangles## 18 December

Today's number is the maximum number of pieces that a (circular) pancake can be cut into with 17 straight cuts.