mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

21 December

This year, I posted instructions for making a dodecahedron and a stellated rhombicuboctahedron.
To get today's number, multiply the number of modules needed to make a dodecahedron by half the number of tube maps used to make a stellated rhombicuboctahedron.

Show answer

Folding tube maps

Back in 2012, I posted instructions for folding a tetrahedron from tube maps. When tube maps are used, the sides of the tetrahedron are not quite equal. What ratio would the rectangular maps need to be in to give a regular tetrahedron?

Show answer & extension

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025