Question

The standard form of the number $12345$ is

• A. $1234.5\times {10}^1$
• B. $123.45\times {10}^2$
• C. $12.345\times {10}^3$
• D. $1.2345\times {10}^4$

Answer 1

The correct option is D

$1.2345\times {10}^4$

Any number can be expressed as a decimal number between $1.0$ and $10.0$ (including $1.0$) multiplied by a power of $10$.

Such a form of a number is called its standard form or scientific notation.

Hence, the standard form of the number $12345$ is $1.2345\times {10}^4$.