Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Advent calendar 2015

16 December

Today's number is four thirds of the average (mean) of the answers for 13th, 14th, 15th and 16th December.

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


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