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Advent calendar 2018

4 December

Today's number is the number of 0s that 611! (611×610×...×2×1) ends in.

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

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