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Advent calendar 2017

24 December

Today's number is the smallest number with exactly 28 factors (including 1 and the number itself as factors).

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

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