# 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

prime numbers cryptic crossnumbers circles people maths parabolas chalkdust crossnumber pascal's triangle shapes bases probability taxicab geometry volume graphs functions dodecagons means menace chocolate calculus digits hexagons folding tube maps arrows sum to infinity rectangles chess unit fractions clocks advent star numbers area coins routes doubling crossnumbers shape square roots planes mean complex numbers regular shapes averages irreducible numbers wordplay balancing number division polygons odd numbers partitions sums algebra dates perimeter grids proportion coordinates probabilty factors perfect numbers books percentages dice triangle numbers integration trigonometry lines palindromes floors games differentiation angles symmetry factorials cryptic clues speed sequences ellipses sport spheres logic cube numbers multiples surds quadratics numbers ave remainders cards addition 3d shapes 2d shapes geometry rugby fractions christmas square numbers integers scales triangles colouring multiplication squares crosswords indices money time## 19 December

Today's number is the number of 6-dimensional sides on a 8-dimensional hypercube.

## Cube multiples

Source: Radio 4's Puzzle for Today (set by Daniel Griller)

Six different (strictly) positive integers are written on the faces of a cube. The sum of the numbers on any two adjacent faces is a multiple of 6.

What is the smallest possible sum of the six numbers?

## 3 December

What is the volume of the smallest cube inside which a rectangular-based pyramid of volume 266 will fit?

## 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.

## 2009

Source: Teaching Further Maths blog

2009 unit cubes are glued together to form a cuboid. A pack, containing 2009 stickers, is opened, and there are enough stickers to place 1 sticker on each exposed face of each unit cube.

How many stickers from the pack are left?

## 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?

## Colliding parallel people

If two people stand 1km apart and walk in the same direction, how far will the have to walk until they collide due to the curvature of the Earth? (diameter of Earth = 12,742km)

## Pyramid and tetrahedron

Source: MathsJam

If four equal equilateral triangles form the sides of a square-based pyramid, what is the ratio of the volume of the pyramid to the volume of the tetrahedron whose sides are the four triangles?