Here's how we get there:

1. Move the decimal point: Move the decimal point to the right until you have a number between 1 and 10 (which is 6.3 in this case).

2. Count the moves: You moved the decimal point 5 places to the right.

3. Exponent: Since you moved the decimal to the right, the exponent is negative.

4. Combine: The final result is 6.3 x 10⁻⁵.