Advent calendar 2019

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