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Advent calendar 2017

9 December

Write the numbers 1 to 15 in a row. Underneath, write the same list without the first and last numbers. Continue this until you have just one number left.
Today's number is the sum of all the numbers you have written.
Tags: numbers

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

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