# 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

christmas fractions cube numbers sums indices quadratics calculus numbers menace palindromes doubling cryptic crossnumbers lines square roots square numbers sport speed prime numbers dodecagons irreducible numbers crossnumbers addition volume taxicab geometry chess scales algebra 3d shapes mean integration angles bases folding tube maps factorials polygons ellipses trigonometry colouring regular shapes multiplication ave money routes circles dates partitions planes books floors 2d shapes factors hexagons advent logic percentages pascal's triangle grids parabolas functions clocks differentiation remainders games symmetry chocolate chalkdust crossnumber rectangles area triangle numbers rugby surds time coins geometry sum to infinity sequences coordinates arrows crosswords integers averages wordplay squares shape spheres graphs perimeter unit fractions number complex numbers probabilty triangles digits proportion cryptic clues perfect numbers balancing multiples people maths probability odd numbers division cards dice means star numbers shapes## 5 December

I make a book by taking 111 sheets of paper, folding them all in half, then stapling them all together through the fold.
I then number the pages from 1 to 444.

Today's number is the sum of the two page numbers on the centre spread of my book.