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Advent calendar 2019

1 December

If you write out the numbers from 1 to 1000 (inclusive), how many times will you write the digit 1?

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

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