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