Advent calendar 2019

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