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