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