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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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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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

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