Advent calendar 2018

20 December

Today's number is the sum of all the numbers less than 40 that are not factors of 40.


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


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