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