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