How it works
Divide 13 by 15 and multiply by 100 to get 86.67%. That is a B on the 90-80-70-60 scale, two questions short of full marks. The table lower down has all 16 scores.
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What each question is worth out of 15
Each of the 15 questions is worth 100 ÷ 15 = 6.67 percentage points, so the 2 wrong answers take 13.33 off 100 and leave 86.67%. Type any other score, or a half such as 12.5, and the answer follows as you type.
Questions and answers
What is a 13 out of 15 as a grade?
13 out of 15 is 86.67%, a B. The fraction 13/15 cannot be reduced, because 13 is prime. One more right answer changes the letter: 14 out of 15 is 93.33%, an A.
What is 11 out of 15 as a percentage?
11 out of 15 is 73.33%, a C. That is 4 wrong out of 15. Like 13/15, the fraction 11/15 is already in its simplest form.
What is a 10 out of 15, and is 10 out of 15 passing?
10 out of 15 is 66.67%, a D. The fraction 10/15 reduces to 2/3. Whether a D passes is your school's rule: it does where 60% is the pass mark, and it does not where the mark is 70%.
What is 2 wrong out of 15, or 4 wrong out of 15?
2 wrong out of 15 leaves 13 right, 86.67%. 3 wrong leaves exactly 80% and 4 wrong out of 15 leaves 73.33%. A half point is worth 3.33: 12.5 out of 15 is 83.33%.
What is the grading scale for 15 questions?
You can miss 1 for an A, 3 for a B, 4 for a C and 6 for a D. 12 out of 15 is 80%, the lowest B, and 9 out of 15 is 60%, the lowest D.