Answer:
310000
Step-by-step explanation:
Because you want to round to the nearest ten thousands place, you have to look in the thousands place and see the number with that place, if the number is 5-9 that means you round up and if the number is 4-1 you round down. So to round up you'd have to add a one to the ten thousands place and the rest below that should be zeros (ex:309838-310000) and to round down you would replace the thounds place to with a zero and the rest of the number below that would also be replaced with zeros (ex:304838-300000).