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Dividing the number of questions answered correctly by the total number of questions on the test is the appropriate method for calculating a percentage score. This calculation allows the educator to determine the proportion of questions that a student answered correctly in relation to the total number of questions presented.
For example, if a student answers 18 out of 20 questions correctly, the calculation would be 18 divided by 20, which equals 0.9. To convert this decimal to a percentage, you multiply by 100, resulting in a score of 90%. This method ensures that the score is reflective of the student's understanding of the material relative to the entire test.
Other options do not provide a valid method for calculating a percentage score. Using an even number of questions does not inherently affect the accuracy of the scoring and is irrelevant to the percentage calculation itself. Dividing the total number of questions by the number correct yields a nonsensical value that does not reflect the student's performance. Ensuring that all students can achieve a passing grade is an educational goal but does not influence the calculation of percentage scores.