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