Note that the grades used in primary school are derived from this scale, with Insufficient meaning "4 or less", and the other grades standing for 5-6, 7-8 and 9-10 respectively.
A 10 is not an uncommon grade, especially in low-interest subjects.
A very poor performance is usually awarded a 3 or 4, while a 1 is often reserved for cases of academic dishonesty or some other unacceptable behavior.
Grades with 2 decimal digits can also be awarded in certificates of final examinations in secondary schools, but in that case, they are not rounded.
The same system (10-point scale) is used in Moldova, Finland and Vietnam, including in primary school.