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Advent calendar 2017

10 December

How many zeros does 1000! (ie 1000 × 999 × 998 × ... × 1) end with?

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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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

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