128,955 is round to what?

what do you mean? tenths, hundredths, thousandths? ten thousands, what?

because hundreds would be 129,000, tens would be 128,960.

To round the number 128,955, you need to determine the desired degree of precision. Common options include rounding to the nearest whole number, nearest tenth, nearest hundredth, and so on. Could you please specify to which degree of precision you would like to round the number?