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