548.429 rounded to the nearest tenth.
5 is in the hundreds place
4 is in the tens place
8 is in the ones place
. (decimal)
4 is in the tenths place
2 is in the hundredths place
9 is in the thousands place
since you are rounding to the tenths place, look at the hundredths place.
in this case it is a 2. Since 2 is less than 5, you have to round down (you will disregard any number after the said term, or the term on the right of the one you want when rounding)
So your answer is:
548.4
hope this helps