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