Advent calendar 2015

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