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