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