If by grade you mean percentage, you would have scored 67.5%. 40-13= 27 (27/40) * 100
Well, honey, if you got 4 wrong out of 17 questions, you'd have 13 correct. So, you take your correct answers, divide by the total questions, multiply by 100, and voila, you've got yourself a grade. Math doesn't lie, darling.
13 wrong out of 85 is 72 correct. So percentage score = 100*72/85 = 84.7%
If u get 1-5 wrong A 5-10 wrong B 10-15 wrong C 15-20 wrong D 20 and up u get a F
12/13 correct is a 92% which is an A-
If by grade you mean percentage, you would have scored 67.5%. 40-13= 27 (27/40) * 100
77% or C+
13 wrong out of 85 is 72 correct. So percentage score = 100*72/85 = 84.7%
13 - 4 = 9 correct 9/13 x 100 = 69% (rounded)
You use division. For example 13/47 is approximately 0.276 or 28%. 100-28 is 72 so the grade would be a 72.
10/13 right = 77% grade
If u get 1-5 wrong A 5-10 wrong B 10-15 wrong C 15-20 wrong D 20 and up u get a F
77% or C+
12/13 correct is a 92% which is an A-
54% or F
84.6 around that
8/13 right = 62 %