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