If we want to round the number 842,999 to the nearest ten thousands place, the first thing we have to do is identify the digit in the ten thousands place. The number 4 in the number 842,999 would be the digit in ten thousands place. Next, we have to look at the digit immediately to the right which in this case, the digit would be a 2. Since the number to the right of the ten thousands place is 4 or less, we can round down. Therefore, 842,999 rounded to the nearest ten thousand is 840,000.