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