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