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