To round a number look at the next digit in the right place, if the digit is less than 5, round down and if the digit is 5 or more than 5, round up.
6.4
there are no decimals to round off in 96.
3.91 rounded off to one decimal place = 3.9
To round off 3044.4498, you would look at the digit after the desired decimal place. In this case, the digit after the fourth decimal place is 9. Since 9 is greater than 5, you round up the fourth decimal place to get 3044.45.
69.6
61.6 is the answer
37.7
1.9
21.99 rounded to one decimal place
6.5km
7.2
77.482