# 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

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

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