The document summarizes the most and least mastered skills in Mathematics for grades 4 students at Inopacan Central School over four quarters of the school year. It shows that students mastered skills in numbers and number sense, geometry, patterns and algebra, measurement, and statistics and probability. They struggled most with skills involving fractions, decimals, perimeter, area, and volume. The school aims to help students improve in their least learned skills through the remainder of the academic year.