what he said to me that any fraction value less than 0.25 will round down to 0 (33.13=33)
fraction fall between 0.25 and 0.74 will round up to 0.5 (33.73 = 33.5) (33.25= 33.5)
fraction fall between 0.75 and 0.99 will round to next number (33.75= 34)

anyway he said to me he will read the standard again and will come back to me

sorry for my first post was unclear