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