1.99 would have to round up to 2.0. Because both of the digits cannot round up any more before going up to the next whole number, you have to round up to 2.0.
6.4
3.91 rounded off to one decimal place = 3.9
21.99 rounded to one decimal place
37.7
61.6 is the answer
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