# Puzzles

## 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

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