Question

Express 6.4 x 10 power 5 in usual form​

Answer 1

Given:

Number is $\mathbf{6.4\times 10^{5}}$

To Find:

Express number $\mathbf{6.4\times 10^{5}}$ in usual form.

Solution:

Number $\mathbf{=6.4\times 10^{5}}$

Above number can also be written as:

$\mathbf{Number=\dfrac{64}{10}\times 10^{5}}$

This can also be written as:

$\mathbf{Number=64\times \dfrac{10^{5}}{10}}$

By using identity of $\mathbf{\frac{a^{m}}{a^{n}}=a^{m-n}}$ :

$\mathbf{Number=64\times 10^{5-1}}$

$\mathbf{Number=64\times 10^{4}}$

Number = 640000

Means number $\mathbf{6.4\times 10^{5}}$ in usual form is 640000.