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