Certify Teacher Math Practice Test 2026 - Free Math Certification Practice Questions and Study Guide

To find the difference between the highest and lowest number in the set {2, 5, 9, 3}, you first need to identify those values. The highest number in the set is 9, and the lowest is 2.

To calculate the difference, you subtract the lowest number from the highest number:

9 (highest) - 2 (lowest) = 7.

Thus, the correct answer is 7, representing the amount by which the highest number exceeds the lowest. This reasoning confirms the calculation is accurate, and it highlights the method of identifying the maximum and minimum values within a numerical set to find their difference.