The number 10.989 rounded to 3 significant figures is 11.0
21.3
It is: 1040
130
2.540x10^4
It is then 2.64 when rounded to three significant figures
0.0034088 in three significant figures would be 0.00341
201
31,500
It is: 1040
0.990
21.3
130
0.00241
It's already there.
6.71 is 6.7050 is rounded to three significant figures.
79,800
3.42*10^-5