320 rounded to the nearest hundreds is 300
317 rounded to the nearest hundreds is 300
Put 321 into three columns: Hundreds, Tens, and units. Then you have 3 Hundreds, 2 tens and 1 unit. It therefore is 320. However, if the unit was from 5 -9, you would round the ten up to 3.
300 is the answer approximately
320
320
320
320 = 32000%
320
320
320
320