# 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

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

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