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