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

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