Here's how we get there:
1. Move the decimal point to the left until you have a number between 1 and 10. In this case, we move it 9 places to the left: 1.65
2. Count the number of places you moved the decimal. This number becomes the exponent of 10. Since we moved it 9 places, the exponent is 9.
Therefore, 1650000000 in scientific notation is 1.65 x 109.
