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