# How do you write 250 million in scientific notation?

Jun 4, 2015

250,000,000 $= 2.5 \times {10}^{8}$

Starting with 250,000,000 you can count the number of times you need to shift it one digit to the right until the result is less than $10$. This is the power of $10$ to use for the exponent.

Conversely, if your starting number is less than $1$, count the number of times you need to shift it to the left before it is greater than or equal to $1$. This is the size of the negative exponent of $10$.

For example, $0.0025 = 2.5 \times {10}^{-} 3$