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 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020