# 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

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