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