How do you write exponential form in decimals?

Answer 1

Superscript or e notation.

5 to the 3rd power is written as 5 with superscript 3.

e notation is for multiplication by powers of 10. So 4 times 10 to the 6'th power (4 million) is 4e6 in e notation.

Answer 2

Here is an example: 0.36107 = 3x101 + 6x102 + 1x103 + 0x104 + 7x105.

(you could omit the fourth term, 0x104.)