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