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