Advent calendar 2015

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