# 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

sequences 3d shapes grids clocks mean surds percentages parabolas unit fractions time partitions squares quadratics chess money numbers fractions cryptic clues bases volume proportion colouring people maths area taxicab geometry shape probabilty perimeter folding tube maps coins cards prime numbers logic indices algebra balancing regular shapes symmetry differentiation palindromes floors digits wordplay square roots trigonometry rugby games chalkdust crossnumber spheres triangle numbers cube numbers square numbers planes ave means pascal's triangle 2d shapes menace averages shapes lines triangles probability crosswords dates rectangles geometry graphs sport crossnumbers arrows polygons circles irreducible numbers calculus doubling complex numbers division addition hexagons integers factorials dice christmas multiplication routes multiples odd numbers functions coordinates angles number books speed remainders factors sums ellipses star numbers chocolate advent scales integration dodecagons sum to infinity cryptic crossnumbers perfect numbers## 18 December

Today's number is the maximum number of pieces that a (circular) pancake can be cut into with 17 straight cuts.

## 15 December

If the numbers 1 to 7 are arranged

**7,1,2,6,3,4,5**then each number is either larger than or a factor of the number before it.How many ways can the numbers 1 to 7 be arranged to that each number is either larger than or a factor of the number before it?