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