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