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