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