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