It is said that 98.7345284 % of the biologists use too many significant numbers in their reports.
Following the excellent book “Cell biology by the numbers”, I will more often round my numbers. Here is the book's standpoint on the matter:
“we try to follow the correct notation where “approximately” is indicated by the symbol ≈, and loosely means accurate to within a factor of 2 or so. The symbol ~ means “order of magnitude” so only to within a factor of 10”