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