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