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