The "Plus/Minus" grading system is used at UBC (Vancouver, Canada), as well as at many other post-secondary institutions in Canada. Here is the percentage/mark/GPA value breakdown used here:
Percentage (%) // Letter Grade // GPA value
90-100 // A+ // 4.33
85-89 // A // 4.0
80-84 // A- // 3.67
76-79 // B+ // 3.33
72-75 // B // 3.00
68-71 // B- // 2.67
64-67 // C+ // 2.33
60-63 // C // 2.0
55-59 // C- // 1.67
50-54 // D // 1.00 ?? (not sure)
0-49 // F (fail) // 0.00
During elementary & secondary school, this grading system was not used, at least not in my schools -- around here, grading practices can vary from school to school within the same district.
- Jen

AGD alumna