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