Scientific notation expresses a very large number like 843000000 and very small numbers like 0.000000058 in a shorthand way. Many practitioners work with scientific notation as it is easy to compute and manage. 

Scientific Notion is written in this form:
N $\times$ 10$^{x}$.
Where,
N is a number and which lies between 1 and 10, i.e., (1 $\leq$ N $\leq$ 10),
x is an integer. 

We need to move the decimal point until it becomes a number and then make the exponent either positive or negative. If the decimal is moved to right, then the exponent is positive; whereas when the decimal is moved to left, then the exponent is negative. Positive exponents mean the number is larger and negative means smaller number.

Given below are some of the examples based on scientific notation:

Question 1: Write 40520000 in scientific notation.
Solution:
Given number = 40500000

Here N = 4 and we have to move 7 decimal places.

So, 
40500000 = N $\times$ 10$^{x}$
40520000 = 4.05 $\times$ 10$^{7}$.

Question 2: Write 0.00000062 in scientific notation.
Solution:
Given number = 0.00000062

Here N = 6 and we have to move 7 decimal places.

So, 
0.00000062 = N $\times$ 10$^{x}$
0.00000062 = 6.2 $\times$ 10$^{-7}$.