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