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