Exam I approximate letter grades (out of 80)

Lowest number	Letter grade
76	A
70	A-
68	B+
63	B
60	B-
55	C+
45	C
40	C-

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Exam II approximate letter grades (out of 100)

Lowest number	Letter grade
95	A
85	A-
80	B+
75	B
70	B-
65	C+
60	C
50	C-

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Exam III approximate letter grades (out of 90)

Lowest number	Letter grade
82	A
78	A-
74	B+
65	B
61	B-
57	C+
50	C
45	C-