Who invented counting in tens?
Pre-historic humanoids who discovered that they had 10 digits on their hands.
Gohd
Improved Answer:-
Numbers were once formed on a tally stick whereas 4 notches would indicate 4 and 4 notches with a line through them would indicate 5 and so on.
What are the powers of 10 called million billion trillion zillion then?
100 = one
101 = ten
102 = hundred
103 = thousand
104 = ten thousand
105 = hundred thousand
106 = million
109 = billion
1012 = trillion
1015 = quadrillion
1018 = quintillion
1021 = sextillion
1024 = septillion
1027 = octillion
1030 = nonillion
1033 = decillion
10100 = googol
10303 = centillion
1010^100 = googolplex
NB: 'a zillion' is not a real number.
He had one child, a son John Archibald Venn, who became president of Queen's College, Cambridge, in 1932,
Which subject was not covered in the Principia Mathematica?
Prinicipia Mathematica did not cover the rational basis for religion.
The sum of the numbers 1 - 99?
4950.
If you add the pairs
(1+99)+(2+98)...
You get 100 for each pair.
There are 49 pairs, and the 50 stands alone.
So 4900 +50 is
4950.
What is a 7 sided 3d figure called?
It's a pentagonal prism or a hexagonal pyramid. (maybe there are other answers)