Hello,
Alright so we are looking for a number that is ten thousand less than 842,719, so first of all, identify the place values and find the "ten thousands" place value. The nimber that is in the "ten thousands" is 42, 719 so we need to subtract 10, 000 from 42, 719. Easy either use a calculator, mental math or subtract.
42,719-10,000=32, 719