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