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proportion calculus doubling graphs partitions multiplication sequences shape prime numbers balancing floors algebra scales remainders money arrows 3d shapes star numbers percentages dodecagons mean spheres shapes geometry books squares differentiation advent symmetry rectangles parabolas chalkdust crossnumber palindromes people maths ellipses christmas chocolate probabilty rugby sport perfect numbers multiples speed perimeter sum to infinity area crossnumbers volume taxicab geometry cube numbers square roots means sums grids circles menace colouring hexagons cryptic crossnumbers folding tube maps indices ave numbers addition logic regular shapes fractions games factorials wordplay trigonometry square numbers functions odd numbers time lines bases angles quadratics 2d shapes probability averages integers crosswords routes coins number digits surds dates triangle numbers clocks coordinates triangles pascal's triangle planes complex numbers cryptic clues integration irreducible numbers unit fractions polygons factors cards division dice chess