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Advent calendar 2017

14 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of squares in a 13×13 grid of squares

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

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