If you mean 0.0015 then it is 1.5*10^-3 in scientific notation
2.5 mcg in Scientific Notation = 2.5 x 100mcg
It is: 9.3*10^-2 in scientific notation
It is: 8.0*10^-4 in scientific notation
It is: 4.73829*10^5 in scientific notation
376.23 in Scientific Notation = 3.7623 x 102
80,736 in Scientific Notation = 8.0736 x 104
1,981 in Scientific Notation = 1.981 x 103
15,100.00 in Scientific Notation = 1.51 x 104
-0.0065 in scientific notation = -6.5 × 10-3
Your 76,254,048,000,000,000,000,000 is 7.6254048 x 1022 in scientific notation. Note that there is only onedigit to the left of the decimal, and the rest of the quantity is expressed in powers of ten.
You would write it as 5.6x10-5
830 would not normally need be written in scientific notation. However, it would be 8.3x102