How do you write the standard 23.9 in standard form?

To write the number 23.9 in standard form, you express it as a product of a number between 1 and 10 and a power of ten. This can be done by moving the decimal point one place to the left, resulting in 2.39. Therefore, in standard form, 23.9 is written as ( 2.39 \times 10^1 ).