Here's how to get there:
* Move the decimal: Start with 10200. Move the decimal point to the left until you have a number between 1 and 10 (in this case, 1.02).
* Count the moves: You moved the decimal four places to the left.
* Exponent: The number of places you moved the decimal becomes the exponent of 10. Since you moved it four places to the left, the exponent is 4.
Therefore, 10200 in scientific notation is 1.02 x 104.
