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