mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

4 December

There are 5 ways to tile a 3×2 rectangle with 2×2 squares and 2×1 dominos.
Today's number is the number of ways to tile a 9×2 rectangle with 2×2 squares and 2×1 dominos.

Show answer

Archive

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

Tags

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

Archive

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