best thing to do, is ask your teacher
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i am in 7th grande and got 250 on winter. in 6th grade i got 238. so i think 217 is an average grade because i am one of the best students in my class.
If there are 10 questions on the test then they are each worth 10 point to make a total of 100. If you miss one question, then you got 9 right (10 - 1 = 9) so 9 times 10 would be a grade of 90.
You would get a 77%. You do 14 (the amount you got right) divided by the total amount of questions (18). So 14/18 which equals 0.77777777...
One can expect to find free math worksheets for 9th grade students by looking in teachers manuals and then photocopying the lesson and printing it out.
if you are looking for a grade that is out of 100, take the amount of points you got and divide by 20. then multiply by 100 for example if you got 17 out of 20 points 17/20=.85 multiply by 100 the grade is an 85% now on a 100 point scale