Test percentile scores commonly reported on most standardized assessments a child takes in school. Percentile literally means per hundred. Percentile scores on teacher-made tests and homework assignments are developed by dividing the student's raw score on her work by the total number of points possible. Converting decimal scores to percentiles is easy. The number is converted by moving the decimal point two places to the right and adding a percent sign. A score of .98 would equal 98%.
test percentiles on a commercially produced, norm-referenced or standardized test, are calculated in much the same way, although the calculations are typically included in test manuals or calculated with scoring software.
If a student scores at the 75th percentile on a norm-referenced test, it can be said that she has scored at least as well, or better than, 75 percent of students her age from the normative sample of the test. Several other types of standard scores may also appear on test reports.