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