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