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

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