This math topic focuses on practicing the skill of calculating a 10% reduction of various numbers. Each question provides an original number and requires finding what 10% equals and then determining what 10% less than the original number is by subtracting this value. The concept is designed for introductory learning of percentage reductions, helping students understand how to adjust numbers based on percentage changes. Multiple choice answers are provided, allowing learners to select the correct calculation of 10% less than the given number.