Converting Hand Held Times
Rule 3.8. Art.3... If FAT and manual times must be integrated, the hand - held times shall first be rounded up to the slower one - tenth of a second. Then a conversion factor of 0.24 must be added (i.e. MT+.24=FAT). A record shall not be granted unless the time is recorded by FAT. This rule is found on page18 of the 2016 Track and Field and Cross Country Rulebook
If a 100 Meter hand held time is 11.21 you must round up to the next tenth (not the closest) which would be 11.30. You then need to add 0.24 to that time. New time is now 11.54