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

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