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Top 10 calendar facts

Selected as the most interesting among mathematics related questions in
Mathematics quiz
Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD? 19.
There was no year number zero. There were only 1999 years between 1000BC and 1000AD.
Gizem İsmailoğlu
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5
Very interesting!
math facts
Which day was the last of the 20th century? 31 Dec 2000.
There was no year number zero. So, the first century started on 1 Jan 1. Similarly, 21th century started 1 Jan 2001.
Jason Beagley
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3
Very interesting!
maths facts
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If there is Friday 13th in a month, then ... This month starts on Sunday.
If 1st is Sunday then Friday is on 6th and 13th.
lukasz Poland
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1
Very interesting!
legends facts
How many times in a year may Friday 13th happen? Up to 3.
Friday 13th happens three times in a year only if it starts on Thursday or (leap year) on Sunday.
lukasz Poland
0
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1
Very interesting!
symbols facts
How many months have 31 days in them? 7
January, March, May, July, August, October and December.
Kasia
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0
Very interesting!
mathematics facts
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