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

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

Archive

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