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