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