# Advent calendar 2018

## 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

cube numbers lines area circles division calculus prime numbers triangles coordinates probabilty trigonometry taxicab geometry menace books chocolate ellipses algebra spheres star numbers factorials symmetry percentages sum to infinity addition dodecagons regular shapes parabolas shapes geometry functions wordplay shape arrows angles means advent floors chess indices perimeter doubling odd numbers 2d shapes graphs digits ave sequences money multiples differentiation integration hexagons rugby proportion people maths number mean pascal's triangle square roots grids crossnumbers chalkdust crossnumber squares games polygons remainders surds dice volume probability partitions integers dates folding tube maps balancing factors fractions clocks planes palindromes crosswords complex numbers bases scales multiplication triangle numbers christmas square numbers 3d shapes averages coins cryptic crossnumbers logic speed routes cards irreducible numbers sport quadratics cryptic clues unit fractions rectangles colouring time numbers sums perfect numbers## 23 December

Today's number is the area of the largest area rectangle with perimeter 46 and whose sides are all integer length.