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