How it works
13 is a prime number, so no score from 1 to 12 simplifies as a fraction or lands on a whole percent. Each question is worth 7.69 points. The table below lists all 14 scores.
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How close 9 out of 13 is to a C
Divide 9 by 13 to get 0.6923, which is 69.23%. A C starts at 70% and this page rounds nothing up to reach it, so the letter is a D with 4 wrong. The gap is 0.77 of a point. Half a point is worth 3.85, enough to close it: 9.5 out of 13 is 73.08%.
Questions and answers
What is 9 out of 13 as a percentage?
9 out of 13 is 69.23%, a D on the 90-80-70-60 scale. A school that rounds to the nearest whole percent writes 69%, which is still a D.
What is a 10 out of 13?
10 out of 13 is 76.92%, a C, with 3 wrong. It is the only whole score out of 13 that earns a C: one fewer right is a D and one more is a B.
What is 11 out of 13 as a percentage, or a 12 out of 13?
11 out of 13 is 84.62%, a B, and 12 out of 13 is 92.31%, an A. Missing a second question turns the A into a B, and a third turns it into a C.
Is 8 out of 13 a D, and what about 7 out of 13?
8 out of 13 is 61.54%, the lowest D. 7 out of 13 is 53.85%, an F where a D starts at 60%. Further down, 4 out of 13 is 30.77%. Schools set their own pass mark, so check yours.
How does the grading scale out of 13 work?
An A allows 1 wrong answer, a B 2, a C 3 and a D 5; 6 or more wrong is an F. The D takes two scores, 8 and 9, while the B and the C take one each.