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