10
55
750
50
18500
693500
650
The smallest number that can be rounded off to 400 is 350, as any number from 350 to 399.99 will round to 400. Conversely, the greatest number that can be rounded off to 400 is 449.99, since numbers from 400 to 449.99 will also round to 400.
It is: 3.45 that rounds off to 3.5
15000
100000.
50
850