Advent calendar 2018

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