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


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