Look at the second(2nd) decimal place. If it is '5' or greater, then add '1' to the first decimal place. . Then drop the rest of the decimals.
Hence 16.67
The second decimal place is '7' , so it is greater than '5'. So add '1' to '6' = 7
Hence 16.7 Ignore any more decimals to the right.
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to round 68.4 to one decimal place = 68.4
The decimal 13.5 is already rounded to one decimal place.
It will round up to 0.9 to one decimal place
To one decimal place it is 4.1
0.043 rounded to one decimal place is 0.0