1. Move the decimal point: Move the decimal point to the right until you have a number between 1 and 10. In this case, you need to move it two places to the right: 8.6

2. Count the moves: You moved the decimal point two places to the right. This means you've multiplied the original number by 10², or 100.

3. Write in scientific notation: The number in scientific notation is: 8.6 x 10⁻²

Explanation:

* The "8.6" is the number between 1 and 10.

* The "10⁻²" represents the power of 10 needed to get back to the original number. Since you moved the decimal right, the exponent is negative.