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Advent calendar 2016

1 December

One of the digits of today's number was removed to leave a two digit number. This two digit number was added to today's number. The result was 619.

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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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