Here's how to get there:

1. Move the decimal point to the right until you have a number between 1 and 10. In this case, you'd move it four places to the right, resulting in 1.05.

2. Count how many places you moved the decimal. Since you moved it four places to the right, the exponent of 10 will be -4.

3. Combine the number and the exponent of 10. This gives you 1.05 x 10⁻⁴.