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