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