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