5.310 to the negative third power in standard notation = 0.00531
* * * * *
Actually, that is 5.310*10-3 which may have been what you were looking for.
However, the answer to the question, as asked, is
5.310-3 = 1/5.3103 = 1/149.72 = 0.006679 (approx).
2-3 in standard notation is 0.125
0.00795
0.0067
0.0064871
9.11*103 IS in standard notation.
729
125
343
3*3*3
8,500
10^3 Scientific notation : 1X10^3
Nine to the third power (93) is the same as 9 x 9 x 9, which equals 729 in standard notation.