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

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