Describe how the names of the negative integer powers of 10 correspond to the names of the positive integer powers of 10.

"th" is added to the name of the negative power. Here are a few of them ...

10¹ = ten; 10⁻¹ = tenth

10² = hundred; 10⁻² = hundredth

10³ = thousand; 10⁻³ = thousandth

10⁶ = million; 10⁻⁶ = millionth

10⁹ = billion; 10⁻⁹ = billionth