Question

Since our number system is on a base-10 notation, we do not need to learn scientific notation.

Answer 1

Yes we do.  Without scientific notation, we would be in deep do-do
whenever we need to tell somebody else the mass of the sun, the
number of electrons in 1 coulomb of charge, the frequency of our
favorite radio station, or the wavelength of orange light.

Answer 2

Answer:

Yes we do need to learn scientific notation.

Explanation:

If the number is greater than 10, then we have to move the decimals toward the left till we got the number between 1 to 10 and write the power of 10 in terms how much we move the decimal place. And finally we write the number in the power of multiply of 10.

Example: If we want to write the number 143576 in scientific notation we will write this as,

$1.43\times 10^{5}$

Similarly If the number is less than 10, then we move the decimals toward the right till we got the number between 1 to 10 and write the power of 10 in terms how much we move the decimal place. And finally we write the number in the power of multiply of 10.

Example: If we want to write the number 0.000099 in scientific notation, then we can write this as,

$9.9\times 10^{-5}$

Therefore, to describe the very large number very accurately such as speed of light, distance of the Jupiter from the earth and also very small number accurately such as plank's constant, mass of electron  we have to learn scientific notation.