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