Advent calendar 2020

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