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