mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

6 December

There are 5 ways to tile a 4×2 rectangle with 2×1 pieces:
How many ways are there to tile a 12×2 rectangle with 2×1 pieces?

Show answer

7 December

There are 15 dominos that can be made using the numbers 0 to 4 (inclusive):
The sum of all the numbers on all these dominos is 60.
Today's number is the sum of all the numbers on all the dominos that can be made using the numbers 5 to 10 (inclusive).

Show answer

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 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

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

Archive

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