300
348
Look at the digit after the decimal point. It is 8, the number will be rounded up, to give 348 as the answer.
348.00
300
Take your choice out of: 345, 346, 347, 348 and 349
300.
350
0
Any number between 250 and 350 - including 250, but not including 350 (depending on the exact rules used, actually).
300
To the nearest ten: 350 To the nearest tenth: 348.0