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

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