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