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