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