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