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