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