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

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