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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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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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

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