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

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