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Advent calendar 2017

16 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of rectangles (of any size) in a 2×19 grid of squares

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

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