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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