How do you write 6.92*10^-8 in standard notation?

$6.92 \cdot {10}^{- 8} = 0.0000000692$
The power of ten indicates the position of the decimal point. If we are saying that a number in scientific notation is $6.92 \cdot {10}^{- 8}$ that means that the decimal point must be placed $8$ positions below the initial position, which is always the one corresponding to the number of units.