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