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21 December

Today's number is a multiple of three. The average (mean) of all the answers that are multiples of three is a multiple of 193.
Tags: averages, mean

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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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

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