mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

24 December

There are six ways to put two tokens in a 3 by 3 grid so that the diagonal from the top left to the bottom right is a line of symmetry:
Today's number is the number of ways of placing two tokens in a 29 by 29 grid so that the diagonal from the top left to the bottom right is a line of symmetry.

Show answer

6 December

There are 12 ways of placing 2 tokens on a 2×4 grid so that no two tokens are next to each other horizonally, vertically or diagonally:
Today's number is the number of ways of placing 5 tokens on a 2×10 grid so that no two tokens are next to each other horizonally, vertically or diagonally.

Show answer

Archive

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

Tags

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

Archive

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