Scientific Notation

40,000 = 4 x 10^4

No, there is no such requirement or convention.

It is: 4.672*10^6

2.46 x 10^5

It is 6.78234*10^5.

It is: 8.04672*10^4

It is: 1.3*10^6

1.063 x 10^2

It is: 5.7048*10^1

It is: 1.23*10^5

5.543 x 10^-3

8.0005 x 10^-3

It is: 2.57*10^5.

1 x 10^13 or 1e+13

0.000881 in scientific notation is: 8.81*10^-4

6.700

It is: 2.8*10^11 = 280,000,000,000

It is: 8.23*10^4

It is: 8.9 x 10^6

4.085 x 10^3

1.6 trillion in scientific notation = 1.6 x 10^12

It is: 5.47*10^5

2.9029 x 10^4

It is: 4.1*10^-3

It is: 7.6*10^-5