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