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