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