To the nearest hundred, 4500
that actually doesn't round because the number is in the thousands place not the ten thousands place
In today's notation it is: (IV)CDXCIX = 4000+400+90+9 = 4499 But the Romans probably wrote the equivalent of 4499 simply as I(IV)D = -1 +4000 +500 = 4499
736 to the nearest 1000, is 1000.
1000
1000
1000
1000
1000
1000
1000
It is: 500 to the nearest 100 but zero to the nearest 1000