# How do you write 123,000,000 in scientific notation?

$1.23 \times {10}^{8}$
To find the exponent, count the number of time you need to shift the number one digit to the right before the result is less than $10$.
In our example, $123 , 000 , 000$ needs to be shifted to the right $8$ times before the result $1.23$ is less than $10$, so 123,000,000 = 1.23 xx 10^8
If the number you start with is less than $1$, then count the number of times you need to shift it to the left before the result is greater than or equal to $1$. For example, $0.00123 = 1.23 \times {10}^{- 3}$