Oh, dude, that's easy! So, like, 3.42 is closer to 3 than it is to 4, right? So when you round it to the nearest whole number, it's gonna be 3. I mean, unless you want to get all technical and stuff, but who has time for that?
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Well, honey, if you want to round 3.42 to the nearest whole number, you just look at the decimal part. Since 0.42 is greater than 0.5, you round up to the next whole number. So, 3.42 rounded to the nearest whole number is 4. Hope that clears things up for ya!
Talking about converting 342 to solid dollars, meaning no change, it is already there. Just drop the place holding 0s at the end. 342 is already a whole number, since there is no decimal value.
When rounding 342 to the nearest hundred, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we round down. Therefore, 342 rounded off to the nearest hundred is 300.
3.42 = 171/50 or 3 21/50
It is not possible to give a sensible answer to the question since you have not stated the inits for 342 and 156. There number of square feet in 342 inches x 156 inches will be quite different from that in 342 miles x 156 miles!
3.42 as a mixed number = 342/100 = 171/50 = 3 21/50