2 December

What is the maximum number of lines that can be formed by the intersection of 30 planes?


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


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