Advent calendar 2016

2 December

What is the maximum number of lines that can be formed by the intersection of 30 planes?


Show me a random puzzle
 Most recent collections 

Advent calendar 2020

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2021