At the age of 13, students are typically in 7th or 8th grade, depending on their birthdate and the school system they are in. In the U.S., children usually start 1st grade around age 6 and progress one grade each year. Therefore, by age 13, most will have completed elementary school and be in middle school.
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10/13 right = 77% grade
77% or C+
They will be in Grade 3 . Grade 1 : 6 Grade 2 : 7 Grade 3 : 8 Grade 4 : 9 Grade 5 : 10 Grade 6 : 11 Grade 7 : 12 Grade 8 : 13 Grade 9 : 14 Grade 10 : 15 and so on.
84.6 around that
You use division. For example 13/47 is approximately 0.276 or 28%. 100-28 is 72 so the grade would be a 72.