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Advent calendar 2015

16 December

Today's number is four thirds of the average (mean) of the answers for 13th, 14th, 15th and 16th December.

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
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Cryptic crossnumber #2

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

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