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