# 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

floors squares shape triangle numbers trigonometry probability dodecagons 3d shapes palindromes routes fractions probabilty triangles bases coins regular shapes money complex numbers cube numbers doubling parabolas area planes grids volume differentiation algebra proportion books lines addition menace time cryptic crossnumbers digits shapes chocolate wordplay means number multiples integration sum to infinity spheres sums perfect numbers unit fractions sequences integers functions taxicab geometry games star numbers perimeter people maths partitions scales polygons square numbers rectangles crosswords ellipses arrows pascal's triangle angles chalkdust crossnumber factors chess advent calculus crossnumbers dice numbers dates square roots division hexagons prime numbers logic indices surds mean geometry graphs ave rugby speed sport christmas coordinates quadratics 2d shapes colouring clocks symmetry averages percentages circles irreducible numbers remainders folding tube maps factorials cryptic clues odd numbers balancing cards multiplication## 21 December

Today's number is a multiple of three. The average (mean) of all the answers that are multiples of three is a multiple of 193.