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Advent calendar 2017

11 December

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

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

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