<P> The typical grades awarded for participation in a course are (from highest to lowest) A, B, C, D, and F. Variations on the traditional five - grade system allow for awarding A+, A, A -; B+, B, & B -; C+, C, & C -; D+, D, & D -; and F. In primary and secondary schools, a D is usually the lowest passing grade, however, there are some schools that consider a C the lowest passing grade, so the general standard is that anything below a 60 or 70 is failing, depending on the grading scale . In college and universities, a D is considered to be an unsatisfactory passing grade . Students will usually still earn credit for the class if they get a D, but sometimes a C or better is required to count some major classes toward a degree, and sometimes a C or better is required to satisfy a prerequisite requirement for a class . </P> <P> Below is the grading system found to be most commonly used in United States public high schools, according to the 2009 High School Transcript Study . This is the most used grading system, however, there are some schools that use an edited version of the college system . </P> <Table> <Tr> <Th> Letter Grade </Th> <Th> Percentage </Th> <Th> GPA </Th> </Tr> <Tr> <Td> </Td> <Td> 90% - 100% </Td> <Td> 4.0 </Td> </Tr> <Tr> <Td> </Td> <Td> 80% - 89% </Td> <Td> 3.0 </Td> </Tr> <Tr> <Td> </Td> <Td> 70% - 79% </Td> <Td> 2.0 </Td> </Tr> <Tr> <Td> </Td> <Td> 60% - 69% </Td> <Td> 1.0 </Td> </Tr> <Tr> <Td> </Td> <Td> 0% - 59% </Td> <Td> 0.0 </Td> </Tr> </Table> <Tr> <Th> Letter Grade </Th> <Th> Percentage </Th> <Th> GPA </Th> </Tr>

What does a b c d e and f mean in grades