Here's how we get that:
1. Move the decimal point to the left until there is only one non-zero digit to the left of the decimal point. In this case, we move it 9 places to the left.
2. Count the number of places you moved the decimal point. This becomes the exponent of 10.
3. Write the number with the decimal point after the first non-zero digit, multiplied by 10 raised to the power of the number of places you moved the decimal point.
