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