Respuesta :
below 5 → round down
5 and up → round up
Look at the number in ones' place: 9
Round up the number in tens' place to 5
Look at the number in tens' place: 5
Round up the hundreds' place to 7
Result : 4278700
5 and up → round up
Look at the number in ones' place: 9
Round up the number in tens' place to 5
Look at the number in tens' place: 5
Round up the hundreds' place to 7
Result : 4278700