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