Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Advent calendar 2017

16 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of rectangles (of any size) in a 2×19 grid of squares


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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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


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