Advent calendar 2019

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