6, then ending 0 is not significant without a decimal
As of October 2011, around 5 trillion. See the link below.
There are 3 significant figures in this number.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are 4 significant figures in this number.
There are 2 significant figures in this number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
10
3 significant figures.
Three significant figures are in this number.
The number of significant figures is one.
There is one significant figure in the number 0.003