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