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