It is 307 cm.
307 cm
three
No. 0.0000123 has three significant digits.
Three, because if it were not significant, the final 0 should not be there.
0.0034088 in three significant figures would be 0.00341
201
2.005
16.3
6.71 is 6.7050 is rounded to three significant figures.
0.00185
31.5
0.00994 Note that all leading zeroes are non-significant.
323.565 rounded to three significant digits is 323.56
0.00909 has three significant digits.
Three significant digits.
There are three significant digits in 3.56.
It isn't clear what the question is. If you are supposed to multiply or divide, and if by "signification figures" you mean significant digits, do the multiplication (or division), then round to three significant digits - since the least-precise of the numbers only has three significant digits.
Three - zeros between significant digits are significant.