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