For anyone using a MSPN grading scale for K-2 students: What values do you use for the grades? Ours was set at 69,79,89, and 99. It was a disaster as one high grade would bring up a slew of lower grades to the higher one. For example: 17N + 1P= P as the final grade. Do you use a 1,2,3 and 4? Please help. Thank you.