If you've ever heard the term "5 or above, give it a shove. 4 or below, let it go". then that should help you with most questions for rounding. But, the number that's in the tenth's place is 3 and the number to it's right is 4, going back to the quote I've said before. The number 3 is less than 4, so you have you leave the 3 alone and the rest of the numbers the right of the 3 are 0, since you don't need them.
