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