Advent calendar 2019

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