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