Advent calendar 2017

11 December

Two more than today's number is the reverse of two times today's number.


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


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